Is Nano Silver Safe? What Our Research on Third-Generation Nano Silver Shows

Third-generation nano silver is safe in oral care products. A plant-based sugar coating keeps each silver particle stable and non-reactive in your mouth.

Colloidal silver is a different product. It's older, it reacts the moment it touches water, and it builds up in the body over time.

I'm Dr. Jennifer Vitez, a general and family dentist in Santa Barbara, California, known on Instagram as @jennyv_dmd. I work with Dr. Ryan Nolan, founder of the Cariology Institute, on the research behind third-generation nano silver.

What is nano silver?

Nano silver is silver broken down into particles so small they're measured in nanometers.

That tiny size gives each particle a huge surface area. More surface means the silver works better against bacteria. It also makes each particle more reactive.

So every nanoparticle needs a stabilizer. The stabilizer keeps the particles individually spread out in the liquid instead of clumping together.

Think of a room full of people. Spread out, each person can do a job. Huddled into one clump, most of them are stuck in the middle doing nothing.

The stabilizer is what separates one generation of nano silver from the next.

Nano silver vs colloidal silver: the three generations

There are three generations of silver particles used in health products. A study or a label about one tells you very little about the others.

First generation: colloidal silver

Colloidal silver is the grandfather generation. It was on the market long before I graduated from dental school in 2009.

It isn't stable. With regular use, the silver builds up in the body's tissues. That's where the stories of people turning blue come from.

Second generation: detergent-stabilized silver

The next step used detergents to hold the particles in solution.

It didn't hold up. Shelf life was poor, and it wasn't practical for long-term use.

Third generation: plant-based nano silver

This is the generation Dr. Nolan and I work with.

Each silver particle is wrapped in a polysaccharide, a chain of plant-based sugar. Set at the right pH and temperature, that chain forms a stable coating around the particle.

The coating matters for two reasons:

• It keeps each particle stable and separate, so it can do its job
• If the coating breaks down during digestion, what's left is sugar

Is nano silver safe?

Yes. Third-generation nano silver is safe for use in mouthwash and toothpaste.

The coating stays intact in your mouth. It holds until the stomach, where digestion can break it down.

Because it stays coated, it doesn't clump the way some other nanoparticles do.

If a trace amount of silver does lose its coating, it becomes a charged ion. It binds with electrolytes or water in the body. Accidentally swallowing a little mouthwash is very different from drinking colloidal silver every day.

The study that tested the wrong silver

A colleague once commented on one of my posts with a study that claimed nano silver can cross the blood-brain barrier.

I read it carefully and checked which generation it tested. It was colloidal silver.

Colloidal silver and plant-based nano silver are two completely different materials. A study on one doesn't apply to the other.

The biggest mistake I see is treating every kind of nano silver as the same product.

Red flags when you read a scary silver headline:

• It says "silver" or "colloidal silver" and never mentions a coating
• The people in the study drank silver instead of rinsing with it
• It shows a link and calls it a cause

Why colloidal silver is dangerous

Colloidal silver reacts the moment it touches water, and your mouth is the first place it touches.

That shouldn't surprise anyone who owns silver jewelry. My necklace is sterling silver, 92.5% silver stabilized with 7.5% copper. It still tarnishes from my skin, my sweat, and the air.

Silver reacts easily by nature. And our bodies are mostly water.

Drinking colloidal silver has been a wellness trend for years. Colloidal silver mouthwashes are easy to buy online too, and most shoppers can't tell them apart from nano silver.

Swallowed over months or years, colloidal silver can cause:

• Argyria, a blue-gray tint to the skin, eyes, nails, and gums that stays even after you stop taking silver
• Kidney damage and seizures, in rare cases
• Drug interactions with some antibiotics and with levothyroxine, a thyroid medication

It still happens today. A 2025 case report in the Medical Journal of Australia described argyria caused by intentional silver consumption.

Back in 1999, the FDA ruled that over-the-counter colloidal silver products are not generally recognized as safe and effective.

What nano silver does in your mouth

It targets harmful bacteria without wiping out everything

Nano silver is a very effective antimicrobial, including against bacteria that resist standard antibiotics (Wahab et al., 2021). It was originally designed for patients exposed to bacteria that resist standard antibiotics.

It doesn't carpet bomb your mouth. It removes what's harmful to you without harming the mouth itself.

That matters for your oral microbiome. Your mouth needs its good bacteria, which is one reason Dr. Joyce steers patients away from alcohol-heavy formulas when they choose a daily mouthwash.

It helps calcium reach your enamel

Our research points to nano silver acting as a semi-direct remineralizing agent (Callister et al., 2020).

This is the plain version I give my patients:

• Calcium in the product strengthens and remineralizes your teeth
• Xylitol is sweet, so it revs up your saliva flow
• Nano silver works with both to help put the calcium on your teeth

Mouthwash is an addition to brushing and flossing. It doesn't replace them.

Nano silver vs nano-hydroxyapatite

Nano-hydroxyapatite (nHAp) is a first-generation nanoparticle. It's held in water with a salt, potassium chloride, as its stabilizer.

That ratio has to stay exact. Change it, and the particles clump.

They also clump when they meet mucins, the natural proteins in saliva that help protect your teeth. Clumped particles can't break down into the building blocks your enamel needs.

That's a formulation problem, and it's a big part of why the marketing for nHAp toothpaste has run ahead of the evidence.

Third-generation nano silver keeps its coating, so clumping isn't a concern.

How to choose a nano silver product

• Look for a named coating. Plant-based or polysaccharide-coated silver is third generation. Skip anything labeled colloidal silver.
• Pick a short ingredient list. I can name every ingredient in the rinse I recommend on one hand.
• Choose alcohol-free for daily use.
• Check the calcium. Calcium acetate dissolves best. Calcium glycerophosphate looks promising. Calcium carbonate acts mostly as an abrasive and doesn't dissolve well.
• Read the warnings. In California, a Prop 65 warning means the product may contain a trace of a listed chemical, such as lead.

Recommended: Elementa Silver

Alcohol-free nano silver rinse with calcium acetate and xylitol, and a short ingredient list.

Full disclosure: I work with Elementa's founder, Dr. Ryan Nolan, who has extensive research behind this ingredient. Code JOYCE20 applies a discount.

Where nano silver is heading

Right now, nano silver is niche, and the science is ahead of the marketing.

That's changing as more independent research comes from teams with no ties to Elementa, Dr. Nolan, or me. That's exactly what this ingredient needs.

Within five years, I expect nano silver to become one of the main antimicrobial agents in dentistry. It could be an excellent alternative to antibiotics, including in gum disease care.

Sources

• Callister, C., Callister, M., Nolan, M., & Nolan, R. (2020). Remineralization potential of a novel silver nanoparticle rinse on severely demineralized enamel in-vitro: A 14-day trial. Journal of Nanomedicine & Nanotechnology, 11(2), 542. https://doi.org/10.35248/2157-7439.20.11.542
• Collins, L., Palanikumar, L., & Bacchi, S. (2025). No silver lining with health misinformation: Argyria caused by intentional silver consumption. Medical Journal of Australia, 223(2), 68–70. https://doi.org/10.5694/mja2.52687
• Food and Drug Administration. (1999). Over-the-counter drug products containing colloidal silver ingredients or silver salts: Final rule. Federal Register, 64(158), 44653–44658. https://www.govinfo.gov/content/pkg/FR-1999-08-17/html/99-21253.htm
• Mayo Clinic Staff. (2025, July 3). Colloidal silver supplements: Are they safe? Mayo Clinic. https://www.mayoclinic.org/healthy-lifestyle/consumer-health/expert-answers/colloidal-silver/faq-20058061
• Wahab, S., Khan, T., Adil, M., & Khan, A. (2021). Mechanistic aspects of plant-based silver nanoparticles against multi-drug resistant bacteria. Heliyon, 7(7), e07448. https://doi.org/10.1016/j.heliyon.2021.e07448

FAQ

Medically reviewed by Dr. Joyce Kahng, DDS

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 the editorial team, medically reviewed by a dentist, corrected in the open.