- Only a white-spot cavity can remineralize. The enamel surface has to be intact.
- A hole in a tooth never grows back. Enamel has no living cells to rebuild it.
- Some cavities can be stopped without a drill, even when they can't heal.
- Fluoride toothpaste has the strongest evidence of anything you can do at home.
- Sugar is the cause. Cutting how much and how often you eat it matters most.
- Oil pulling, saltwater, and clove oil don't rebuild enamel.
- Pain is a poor guide. Large cavities can be painless.
You can heal a cavity naturally only at its earliest stage, while it's a white spot under an intact enamel surface. At that point, saliva, fluoride, and less sugar can push minerals back into the enamel. Once decay breaks the surface and reaches the dentin underneath, enamel can't grow back. Decay at that stage can sometimes be stopped, and a dentist has to seal it, treat it, or fill it.
Can You Heal a Cavity Naturally?
Yes, an early cavity can heal naturally. Tooth decay isn't a one-way street. A 2017 review in Nature Reviews Disease Primers describes it as a dynamic disease of mineral loss and repair, where acid pulls minerals out of enamel, and saliva and fluoride put them back.
That repair works on a white spot, the first sign of a cavity. The surface is still whole, and the damage sits just underneath it. Once the surface breaks and the decay reaches the softer dentin below, the body has nothing to rebuild it with.
"I wish people knew that not every cavity can be 'reversed' or 'remineralized,'" says Dr. Joyce Kahng. "Only a baby cavity has the chances of being remineralized. What drives me crazy as a dentist is when people listen to self-proclaimed health gurus and try to remineralize [a deep cavity] at home. That is pure misinformation, and it's dangerous."
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Which cavities can heal
| Stage | What it looks like | Can it heal at home? | What stops it |
|---|---|---|---|
| Early white spot, surface intact | Chalky or frosty white patch | Yes, it can remineralize | Fluoride toothpaste, less sugar, saliva, calcium products |
| Dark spot that's hard and shiny | Brown or black, smooth to the touch | Often already stopped, or a stain | A dentist checks the texture |
| Early decay into the dentin, surface still intact | Usually seen only on an X-ray, often between teeth | No | Resin infiltration or sealing, then X-ray checks |
| A hole into the dentin | Rough edge, food catching, a hole you can see | No | A filling. Silver diamine fluoride or sealing can stop some |
| Decay near the nerve | Lingering pain, swelling | No | Root canal treatment or extraction |
If you can't tell which one you have, you're in good company. On a cavity's appearance, color misleads most people.
"When it comes to cavities, it's more about textural change than it is the actual color," says Dr. Joyce Kahng. "That's a little harder for a non-dentist to assess, so when in doubt it's a good idea to get it checked out."
Healing a Cavity vs Stopping One
Remineralizing means rebuilding lost mineral in enamel, while arresting means the decay stops getting worse even though the damage stays. The difference decides what you can expect.
A healed white spot can fade or disappear, while an arrested cavity in dentin stays visible, often as a hard brown or black area. It stops growing because the bacteria inside it lose their food supply.
Two findings show how far stopping can go:
Sealing works even over real cavities.
In a 10-year study in the Journal of the American Dental Association, sealed composite placed directly over cavitated decay in dentin stopped those lesions from progressing for the full decade.
Silver diamine fluoride stops most cavities in baby teeth.
A systematic review found that 38% silver diamine fluoride arrested 81% of active cavities in children's primary teeth. The trade-off is that it stains the arrested decay black.
That's also why a dark spot on a tooth isn't automatically a cavity. It can be a stain, or decay that stopped years ago.
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How to Heal an Early Cavity at Home
Fluoride toothpaste twice a day, less sugar, and a healthy flow of saliva are the three things with real evidence for healing an early cavity. Everything else is a supporting act.
Brush With Fluoride Toothpaste Twice a Day
In a Cochrane review of 70 trials with 42,300 children, fluoride toothpaste cut new decayed, missing, and filled tooth surfaces by 24% compared with non-fluoride paste. The effect grew with higher fluoride strength and more frequent brushing.
Dr. Kahng's view on fluoride toothpaste depends on your risk.
"I'm okay if people are not using fluoride and their kids don't have cavities," says Dr. Joyce Kahng.
If you get cavities often, have a dry mouth or have exposed roots, ask your dentist about a prescription 5,000 ppm fluoride toothpaste. In a review of root cavity treatments, 5,000 ppm toothpaste stopped active root cavities more often than regular-strength toothpaste, and the authors rated that evidence as high.
Cut How Much and How Often You Eat Sugar
Sugar is what feeds the bacteria that dissolve enamel. Plaque bacteria turn it into acid, and that acid is the immediate cause of tooth dissolution.
A review in the Journal of Dental Research found a steady dose-response link between sugar intake and lifelong tooth decay, with damage showing even at low intakes. Each snack or sweet drink starts a new acid attack, so grazing all day keeps your teeth under attack for longer.
- Keep sweets to mealtimes instead of spreading them through the day.
- Swap sipping sweet coffee or soda for water between meals.
- Rinse with plain water after something sugary or acidic.
Dr. Danielle Mark of Forest Hills Dental in Queens, New York, gives her patients that last habit. "If you don't have time, go rinse with water after, just so it doesn't sit on your teeth," she said.
Keep Your Saliva Working
Saliva is your mouth's built-in repair system. It neutralizes acid and carries the calcium and phosphate that rebuild enamel, which is why a dry mouth raises cavity risk so sharply.
Drink water throughout the day, ask your doctor whether a medication is drying your mouth, and treat mouth breathing if you have it. Chewing something sugar-free gets saliva flowing.
The evidence for xylitol itself is thinner than its reputation. A Cochrane review found low-quality evidence that a xylitol and fluoride toothpaste cut cavities in children by 13% over three years compared with fluoride alone. It couldn't say whether lozenges, syrups or other xylitol products prevent cavities.
Add Calcium Where It Helps
For frosty white spots, Dr. Kahng suggests a product that delivers calcium back to the tooth, alongside fluoride. Two she has named are MI Paste and the Elementa nano silver rinse.
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MI Paste uses CPP-ACP, a calcium phosphate made from milk protein. It and its fluoride version reduced white spots and helped them remineralize in people with braces. In a network meta-analysis of white spot treatments, the version with added fluoride beat no treatment, while plain CPP-ACP didn't stand out.
Because it comes from milk, it isn't for everyone. Dr. Jennifer Vitez, DMD, of Pathway Dental Group in California, told us it's "pretty halfway decent as a calcium-based remineralizing type of toothpaste. But the one thing is you can't have a child or adult who is allergic to milk."
Elementa is the rinse Dr. Kahng uses herself. She has a discount code with the brand.
"Elementa is probably the top product that I use for myself," says Dr. Joyce Kahng. "It's fluoride-free, so I think it could be a standalone product, but I pair it with fluoride. Using that before the fluoride helps the fluoride to penetrate the biofilm better."
Clean Between Your Teeth Every Day
Early cavities often start where teeth touch, where a toothbrush can't reach, and plaque sits undisturbed. Flossing removes that plaque and lets fluoride and saliva reach the spot.
Natural Cavity Remedies: What the Research Shows
None of the popular home remedies can heal a cavity that has broken through the enamel. A few may lower your risk of new ones.
| Remedy | The claim | What the research shows | Can it heal a cavity? |
|---|---|---|---|
| Oil pulling | Pulls out bacteria and reverses decay | Four small trials, 182 people, 7 to 14 days. Less plaque and fewer bacteria in saliva, high risk of bias, no cavity outcomes | No |
| Xylitol | Starves cavity bacteria | Low-quality evidence for a 13% drop in children's cavities with a xylitol toothpaste | Not on its own |
| Vitamin D | Heals teeth from the inside | Old trials suggest fewer new cavities, low certainty | Unproven |
| Cereal-free diet | Heals cavities | One 1932 study of 22 children found decay hardened and stopped | It stopped decay; nothing regrew |
| Licorice root | Kills cavity bacteria | Lowered cavity bacteria in a few small studies in children | No |
| Clove oil | Treats a cavity | Its main compound, eugenol, numbs pain | No, it numbs |
| Salt water | Kills bacteria and heals | Soothes gums, contains no calcium, phosphate or fluoride | No |
| Baking soda | Neutralizes acid | Dr. Kahng skips baking soda pastes for cavity-prone patients | No |
| DIY calcium toothpaste | Remineralizes teeth | Calcium carbonate is mostly an abrasive and barely dissolves | No |
| Nano-hydroxyapatite toothpaste | Made of what teeth are made of | Dr. Kahng: releases little calcium, good as a desensitizer | Not the best option |
Oil pulling. A systematic review found four small trials of coconut oil pulling, none longer than two weeks, which is far too short to measure cavities. If you enjoy oil pulling, keep it as an extra and never as a swap for brushing.
Licorice root. Two reviews found that licorice, mostly as lollipops, lowered cavity-causing bacteria in children's saliva, and the authors of a second review rated only one of three studies as high quality.
Clove oil. Eugenol, the main compound in clove oil, has long been used in dentistry for its numbing effect. It can take the edge off a toothache while you wait for an appointment, and it does nothing to the decay.
Salt water. A salt water rinse can soothe sore gums. Enamel is rebuilt from calcium, phosphate, and fluoride, and salt water carries none of them.
DIY "remineralizing" toothpaste. Recipes usually mix calcium powder, baking soda, and coconut oil. Dr. Vitez explained the problem with the calcium. "The problem with a lot of calcium-based toothpaste is that they use calcium carbonate, but it's more like an abrasive, and it's not well dissolvable," she said.
Where "Heal Your Cavities With Diet" Comes From
Diet-based "cure your cavities" advice often cites a 1932 study by May Mellanby and C. Lee Pattison in the British Medical Journal.
The researchers gave 22 children a cereal-free diet rich in vitamin D and calcium for an average of 26 weeks. Here's what the paper reports:
- The children averaged 5.4 years old and lived in an institution, confined to bed.
- Cereals were replaced with potatoes, vegetables, milk, meat, eggs, and cod-liver oil or irradiated ergosterol.
- The sugar, jam and syrup stayed the same as in the researchers' earlier diets.
- New cavities nearly stopped, at 0.05 per child.
- Active decay hardened in an average of 4.7 teeth per child, which the authors read as decay slowing and arresting.
So the study showed decay stopping, which matters, but it didn't show enamel growing back. It also compared its group with children from earlier studies, and the children lived under conditions nobody could copy at home.
Later research on vitamin D points the same way, with less certainty than the headlines suggest. A review of 24 controlled trials in 2,827 children found about half as many new cavities with vitamin D. But 22 of the 24 trials predated modern trial design, and the author rated the conclusion low certainty.
The same caution applies to "healing cavities naturally before and after" photos. Dr. Vitez puts personal stories at the bottom of the evidence ladder, the level where "somebody just says, oh, well, it works for me."
Why Dr. Kahng Stopped Recommending Nano-Hydroxyapatite for Cavities
Dr. Kahng used to recommend nano-hydroxyapatite toothpaste, and she changed her mind. Her concern is that the evidence doesn't support the marketing. She has never called it unsafe.
"I think I just learned more of the science," says Dr. Joyce Kahng. "A lot of us were just hoping that it worked. There is some science to it where it feels like it makes sense, but when you look at the mechanism of it, it doesn't do what it's marketed for."
The pitch is that teeth are made of hydroxyapatite, so brushing with it gives the calcium back. She explains that hydroxyapatite is a very stable crystal that doesn't dissolve easily, so it releases little calcium for remineralization. "That doesn't make nHAP useless; it's a great desensitizer," she wrote.
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Dr. Vitez raised a second problem with how the particles behave in a real mouth. "In the presence of mucins, they clump," she said, referring to the proteins in saliva. "And bigger, it cannot do what it's supposed to, where it cannot dissociate into its respective building blocks to help to remineralize teeth."
If you're comparing tubes, the nano-hydroxyapatite toothpaste labels are worth reading closely. For healing an early cavity, fluoride is still the ingredient with decades of trials behind it.
What a Dentist Can Do Without Drilling
Several treatments can stop or reverse an early cavity without a drill or a shot. They work best on spots caught early, which is one more reason to keep your checkups. For a closer look at each option, see how dentists reverse a cavity and treat white spots on teeth.
| Treatment | What it does | Best for | What the research shows |
|---|---|---|---|
| Fluoride varnish | Coats teeth with high-strength fluoride | Higher-risk kids and teens, the best-studied group | 43% fewer decayed surfaces in permanent teeth |
| Resin infiltration (Icon) | Fills the pores of an early lesion with resin | Early decay between teeth, surface intact | About three-quarters lower odds of getting worse |
| Self-assembling peptide (Curodont) | Helps an early lesion regrow enamel mineral | Early white spots and pit lesions | 1.82 times more likely to arrest |
| Silver diamine fluoride | Stops active decay and stains it black | Cavities in baby teeth, people who can't sit for a filling | Stopped 81% of active cavities in baby teeth |
| Sealing | Seals the tooth surface so bacteria lose their food | Grooves and some small cavities | Sealed decay stopped for 10 years in one trial |
Fluoride varnish. A Cochrane review found 43% fewer decayed, missing and filled surfaces in permanent teeth and 37% fewer in baby teeth, at moderate certainty.
"I'm a big proponent of topical fluoride varnish right after a dental cleaning," says Dr. Joyce Kahng. "Your teeth are cleaned, the biofilm has just been removed, so why not have the fluoride varnish?"
Resin infiltration. For early decay between teeth that hasn't broken the surface, a Cochrane review found that sealing or infiltrating the lesion cut the odds of it progressing (odds ratio 0.24) compared with fluoride varnish or flossing advice alone.
Self-assembling peptide. A 2023 meta-analysis in the Journal of the American Dental Association found that Curodont Repair made early lesions 1.82 times more likely to arrest and shrank them by an average of 32%. The authors noted an elevated risk of bias across the six trials and asked for longer studies.
When Is It Too Late to Reverse a Cavity?
It's too late to reverse a cavity once the enamel surface has broken and the decay has reached the dentin. At that point, the damage is permanent, though a dentist may still be able to stop it.
"A hole in a tooth could indicate that your tooth needs immediate treatment," says Dr. Joyce Kahng. "These are the types of cavities that will not reverse on their own."
Red flags
- A hole, pit, or rough edge you can feel with your tongue
- Food catching in the same spot
- A dark spot that feels soft or sticky
- Sensitivity to sweets, cold, or heat that lingers
- Pain when you bite down
- Swelling in your gum or face
Don't wait for pain to tell you. Large cavities can be painless, especially when the nerve inside the tooth has already died.
"A common misconception is that a cavity would hurt," says Dr. Joyce Kahng. "They don't always."
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Pain that comes and goes is no comfort either. Dr. Chanelle Small, an endodontist at Midtown Endodontics in New York City, explains, "The pain may go away because your body's healthy," she said. "But as time goes on, it's only going to get worse." When a cavity hurts, the tooth often still has options, and timing decides which ones.
Can You Wait to Fill a Cavity?
You can sometimes wait on a cavity that's still in the enamel, with X-ray checks, but decay that has reached the dentin needs treatment. The speed depends on how deep the lesion is and on your age.
A Swedish study followed 536 children with yearly X-rays from age 11 to 22, using remineralizing care instead of drilling early. It found that, for cavities between teeth that were still in the enamel, 75% hadn't reached the outer half of the dentin after 4.8 years. Once a lesion reached the border between enamel and dentin, the picture changed fast: 75% held for only 1.3 years.
Age matters too. In the same group followed to age 27, decay moved from the enamel border into the dentin about three times faster in 12- to 15-year-olds than in young adults.
If your dentist suggests watching a spot, ask:
- Is it still in the enamel on the X-ray, or into the dentin?
- When will you take the next X-ray to compare?
- What should I change at home in the meantime?
Can You Heal a Cavity in 2 Days?
Nothing can heal a cavity in 2 days. Even an early white spot remineralizes over months, and every study in this article measured change in months or years. The 1932 diet study ran for 26 weeks, and the Swedish X-ray study followed teeth for over a decade.
What If Scenarios
What If My Child Has a Cavity?
Children's teeth need the same plan: fluoride, less sugar, and checkups. Dr. Vitez notes that kids' teeth are "naturally much softer," which makes early care more important. For cavities in baby teeth, silver diamine fluoride can stop most of them without a drill, at the cost of black staining.
What If I Have Dry Mouth?
Dry mouth removes your main defense. Ask about a 5,000 ppm prescription toothpaste and fluoride varnish at cleanings, and look into what's drying your mouth.
What If the Spot Is Between My Teeth?
These lesions usually show only on an X-ray. If the surface is still intact, resin infiltration is a strong option, and daily flossing keeps plaque off the spot.
What to Do Next
If you see a white spot, keep brushing with fluoride toothpaste twice a day, cut back on sugar between meals, and book a checkup. If you have a hole, pain, or a dark spot that feels soft, see a dentist soon instead of trying to treat it at home.
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- Dr. Joyce Kahng, DDS. Instagram, 1 April 2025: https://www.instagram.com/reel/DH7KgHtyANd/
- Dr. Joyce Kahng, DDS. Instagram, 7 December 2023: https://www.instagram.com/reel/C0jobEVOu6H/
- Dr. Joyce Kahng, DDS. Instagram, 12 December 2025: https://www.instagram.com/reel/DSK8rvmD_LZ/
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- Dr. Danielle Mark, Forest Hills Dental. Recorded conversation, 23 September 2026
FAQ
Can a Cavity Go Away Naturally?
An early cavity can go away naturally if it's still a white spot with an intact enamel surface. Fluoride, saliva and less sugar can remineralize it. A cavity that has formed a hole can't go away on its own.
Can a Stage 1 Cavity Be Reversed?
A stage 1 cavity can be reversed because it's still a white spot under intact enamel. When people say stage 1, they usually mean that early loss of minerals, and fluoride toothpaste, fluoride varnish and less sugar can reverse it.
What Kills Decay in Teeth?
Nothing you can do at home kills decay inside a cavity. A dentist can stop it with silver diamine fluoride, seal it so the bacteria lose their food, or remove it and place a filling.
Can You Reverse Cavities Without a Filling?
You can reverse early cavities without a filling. Fluoride varnish, resin infiltration, and self-assembling peptide treatment work on lesions that haven't broken the enamel surface.
How Long Can a Cavity Go Without Treatment?
A cavity still in the enamel can take years to reach the dentin, while decay already at the dentin moves much faster. In a Swedish study, 75% of enamel cavities between teeth hadn't reached the outer dentin after 4.8 years. Teenagers' cavities progress faster than young adults'.
Can Oil Pulling Heal Cavities?
Oil pulling can't heal cavities. Small, short trials found it reduced plaque and bacteria, but none measured cavities, and oil can't rebuild enamel.
Does Vitamin D Heal Cavities?
Vitamin D hasn't been shown to heal cavities. Older trials suggest it may reduce new cavities in children, but the evidence is of low certainty.
Is Hydroxyapatite Better Than Fluoride for Healing Cavities?
Fluoride is the better choice for healing an early cavity. It has decades of trials behind it, and Dr. Kahng no longer recommends nano-hydroxyapatite for remineralization, though she calls it a good desensitizer.
Dr. Joyce Kahng is a cosmetic dentist, veneer expert, and the founder of Orange + Magnolia Dental Studio in Costa Mesa, CA. With 16+ years in practice and a following of 1.5M+ across Instagram, TikTok, and YouTube, she's known for making dentistry actually make sense. She's been featured in Forbes, Vogue, Allure, Glamour and GQ, and is the creator of the VeneerLIFT™.
Our editorial process · written by Dr. Kahng, corrected in the open.
- 28 Oct 2026 Updated and rewritten: which cavities can heal, what stops decay without drilling, and new sources. Clinical review by Dr. Joyce Kahng, DDS.
- 22 Jan 2023 Updated.
- 10 Jan 2023 Published. Clinical review by Dr. Joyce Kahng, DDS.
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