Can microplastics from dental braces, retainers, and fillings affect your brain?

What's actually in it

Modern dental work relies heavily on plastics. Composite fillings, braces brackets, clear aligners, retainers, and dental sealants are all made from polymer-based materials. Over time, chewing, brushing, grinding, and exposure to hot and cold foods cause these materials to shed microscopic plastic particles into your mouth.

You swallow some of these particles. You may inhale others. Unlike a plastic water bottle you can put down, dental appliances are in your mouth 24 hours a day, sometimes for years at a time.

What the research says

A 2026 systematic review in PeerJ gathered human data on microplastics released from dental materials and their potential neurotoxic effects. The review confirmed that dental appliances do release microplastic particles, and it flagged these as emerging neurotoxicants, chemicals that can harm the nervous system.

The concern isn't just about the plastic itself. Dental microplastics can carry BPA, phthalates, and other additives that leach out along with the particles. These chemicals are known endocrine disruptors that can cross the blood-brain barrier.

Once in the brain, microplastics and their chemical hitchhikers can trigger inflammation and oxidative stress in nerve tissue. Animal studies have shown that microplastic exposure affects memory, learning, and behavior. The human evidence is still building, but the review found enough data to raise a warning flag.

Kids and teens are especially relevant here. They're the ones most likely to have braces, sealants, and retainers, and their brains are still developing. The review called for more research specifically on young people.

You can't avoid dental work that you need. But you can ask your dentist about newer materials with lower particle shedding. Keep retainers clean to slow degradation. And if your child grinds their teeth at night, a custom night guard can reduce the wear that breaks down dental plastics faster.