Are There Microplastics in Night Guards? What the Research Says

 

Short answer: Yes, all plastic-based night guards have the potential to release microscopic particles through normal wear over time. However, current research has not established that custom night guards pose a significant health risk, and scientists are still studying how microplastic exposure from many everyday products affects human health.

💡 Want the full breakdown on safe materials (BPA/BPS-free, latex-free, FDA-approved)? See our [Complete Guide to Night Guard Safety].

Editor's Note (Updated July 14, 2026): We thoroughly reviewed and updated this article to reflect the latest available research on microplastics, dental materials, and custom night guard safety. New scientific findings will continue to be incorporated as the evidence evolves.

Understanding Microplastics in Night Guards

Night guards are meant to protect your teeth — but over time, the materials they’re made from can start to break down. When low-quality plastics degrade through chewing, heat, or repeated boil-and-bite molding, they may release microplastics: tiny plastic fragments less than 5mm in size.

While microplastics aren’t intentionally added to night guards, they can form as a byproduct of wear and tear. That’s why the type and quality of material matter so much. Cheap over-the-counter guards are more likely to shed microplastics, while dental-grade materials like EVA and copolyester are far more stable and biocompatible.

New Research Update (2026)

In early 2026, researchers at the University at Buffalo published one of the most significant studies to date on microplastics released from dental appliances. The researchers found that clear aligners, retainers, and other plastic oral appliances can release microscopic plastic particles that are readily taken up by macrophages—immune cells responsible for removing foreign material from the body. The study also found that thermoformed dental materials generally released fewer biologically active particles than some newer direct-printed polymers. Importantly, the research was conducted in a laboratory setting and did not demonstrate that wearing a custom night guard causes disease or adverse health effects in people. Instead, it highlights the need for continued research while reinforcing the importance of using high-quality, dental-grade materials manufactured to established medical standards. University at Buffalo study

For that reason, material selection matters. At Sentinel Mouthguards, we fabricate our custom appliances from FDA-compliant, dental-grade thermoforming materials rather than inexpensive boil-and-bite plastics, because material quality plays an important role in durability, stability, and long-term performance. 

🔬 What Are Microplastics?

Microplastics are tiny plastic fragments (less than 5mm) that come from the breakdown of larger plastic products. They're not intentionally added to products — they form over time as plastics degrade due to chewing, heat, UV light, moisture, and wear.

🤔 So Do Night Guards Contain Microplastics?

• They don’t start out with microplastics inside them.

• But poor-quality plastic guards (especially boil-and-bite or OTC types) can break down and shed microplastics into the mouth over time.

This shedding is more likely when:

• The guard is old, cracked, or cloudy

• It’s made of low-grade thermoplastics

• It’s chewed on excessively (which most grinders do)

• It’s not cleaned or stored properly

🔬 Can a Night Guard Release Microplastics?

Here’s when the risk is highest:

• Over-the-counter night guards made of cheap thermoplastics

• Worn-out night guards that have visible cracks or cloudiness

• Boil-and-bite guards repeatedly heated and reused

These can break down over time and potentially release particles when chewed or ground on during sleep

A heavily worn or broken night guard should be replaced promptly. If you're unsure whether yours is still safe to wear, read our guide: My Night Guard Broke: What It Means and What You Should Do Next.

✅ Why Sentinel Mouthguards Are Safe

We take material safety seriously. Here’s how our night guards are different:

• BPA-free & Latex-free: No endocrine disruptors or known allergens

• FDA-registered: Our Owner/Operator Number is 10093856

• High-grade dental copolyester or EVA: Durable, medical-grade material built for long-term oral contact

• No fillers or mystery materials

• Made in the USA using strict quality control and transparency

🧼 How to Care for Your Night Guard Safely

Even the best night guard can break down without proper care. Here’s how to extend its life and keep it clean:

• Rinse after each use

• Use an ultrasonic cleaner with UV once a week (like this one)

• Replace every 6–12 months depending on grinding severity

🛡️ Want a Night Guard That’s Safe and Effective?

We make custom-fit night guards using lab-quality materials — just like the dentist, but without the markup. Shop now and rest easy knowing your mouth is protected.

👉 Browse Custom Night Guards

Current Research on Microplastics in Night Guards

Research on microplastics in dental devices like night guards is still ongoing. While studies show that plastics can degrade over time, there’s currently no evidence of significant risk when FDA-approved dental materials like EVA or copolyester are used 【link: https://pmc.ncbi.nlm.nih.gov/articles/PMC7559247/】. The biggest concern comes from low-quality or overseas-made guards that may use PVC, phthalates, or non-medical plastics.

💡 Want the full picture? See our [Complete Guide to Night Guard Safety] for everything you need to know about materials, allergens, and long-term use.

FAQs About Night Guards and Microplastics

Do all night guards release microplastics?
No. Only low-quality or worn-out guards are likely to shed microplastics. Custom guards made from medical-grade EVA or copolyester are stable and safe for nightly use.

Which night guard materials are safest?
The safest options are BPA-free, latex-free, FDA-approved EVA and copolyester. These materials are durable, biocompatible, and designed for long-term oral contact.

How do I know when my night guard is breaking down?
Signs include cracks, cloudiness, rough edges, or changes in texture. If you notice these, it’s time to replace your guard.

Are store-bought night guards toxic?
Some boil-and-bite guards may use lower-grade plastics like PVC or contain phthalates or latex. These can irritate your mouth and are less durable.

Can I prevent microplastics from my guard?
Yes. Choose a custom guard made from dental-grade materials, clean it daily, and replace it on schedule (usually every 1–2 years, sooner for soft guards).

The potential for wearing a night guard to expose individuals to microplastics is still under investigation. Night guards are commonly made from plastic-based materials, which could degrade over time and release microplastic particles.

However, the extent of this occurrence and its health implications are not yet fully understood. While some studies suggest the presence of microplastics in oral care products, including night guards, further research is needed to assess the actual exposure levels and potential risks. It’s essential to stay updated on emerging findings and consult with dental professionals for personalized advice on night guard use and associated concerns.

How do I know if my night guard leaches microplastics?

Currently, there isn’t a straightforward way for individuals to determine if their night guard leaches microplastics. The process of microplastic leaching from dental appliances like night guards is complex and may not be visibly detectable. However, there are some indicators to consider:

1. Visible Degradation: If your night guard shows signs of wear, such as cracking, peeling, or becoming brittle over time, it may suggest degradation of the material, potentially leading to microplastic release.
2. Changes in Texture: Noticeable changes in the texture or surface of your night guard could indicate degradation, which may increase the likelihood of microplastic leaching.
3. Unusual Taste or Odor: If you detect any unusual taste or odor when wearing your night guard, it could be a sign of material degradation, although this may not always be indicative of microplastic release.
4. Regular Replacement: Following the manufacturer’s recommended replacement schedule for your night guard can help minimize the risk of microplastic leaching. Over time, materials may degrade, so replacing your night guard at the specified intervals can help ensure its effectiveness and safety.
5. Consultation with Dental Professional: If you have concerns about microplastic leaching from your night guard, consider discussing them with your dentist or dental professional. They can provide guidance on proper care, maintenance, and replacement of your night guard and offer insights based on the latest research and recommendations.

Are There Alternatives to Traditional Night Guard Plastics?

Some alternatives to standard dental plastics are being explored, but most aren’t yet proven or practical for everyday bruxism use:

• Silicone Guards – Sometimes offered as an alternative, but silicone tends to be bulkier and less durable, making it a poor fit for people who grind heavily.

• Bio-Based Plastics – Plant-derived plastics show promise for reducing environmental impact, but they aren’t widely available in dental labs and haven’t been studied enough for long-term oral safety.

• Custom Dental Plastics (EVA & Copolyester) – The current gold standard. These FDA-approved, BPA-free, and latex-free materials are designed for long-term oral contact and proven safe.

💚 That’s why at Sentinel we only use trusted EVA and copolyester — the safest and most reliable choice for nightly use. See our [Complete Guide to Night Guard Safety] for the full breakdown.

Mitigating Microplastic Concerns

While the potential for night guards to leach microplastics remains a subject of ongoing research, individuals can take proactive steps to minimize environmental and health risks. Regular maintenance and replacement of night guards according to manufacturer recommendations can help mitigate the degradation of plastic-based materials and reduce the likelihood of microplastic release.

Dentists and dental laboratories may also explore alternative materials for night guard fabrication, such as silicone-based polymers or bio-based plastics, which could offer reduced environmental impact and potential health benefits. Additionally, adopting sustainable practices in dental care, such as proper disposal of worn-out night guards and recycling of dental materials, contributes to efforts to address plastic pollution.

By raising awareness and implementing precautionary measures, stakeholders in the dental community can work together to promote dental health while safeguarding the environment against the impacts of microplastic contamination.

Key Takeaways

✅ Custom night guards are made from medical-grade polymers.

✅ Grinding naturally causes material wear over time.

✅ Small particles may be released as the appliance wears.

✅ Researchers are still studying the health effects of microplastic exposure.

✅ A heavily worn or damaged night guard should be replaced.

🧾 Final Thoughts

While the term microplastics can spark concern — and rightfully so — the real risk depends entirely on the quality, material, and age of your night guard. Many over-the-counter options made from cheap plastics may degrade over time, especially with regular grinding and poor maintenance.

At Sentinel Mouthguards, we take your safety seriously. That’s why we use FDA-registered, BPA-free materials sourced from trusted suppliers and designed specifically for long-term oral use. Our custom-fit guards are made to be durable, comfortable, and most importantly — safe. 

References

1. University at Buffalo. Researchers study microplastics released from orthodontic appliances. Published 2026.
2. PubMed: [Orthodontic derived microplastics impact macrophage differentiation and homeostasis] (2026).

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