Do dental composite fillings leak BPA into the mouth?
Yes, in the first hours and days. Resin fillings release a small spike of BPA right after placement.
What's actually in it
Modern white "composite" fillings use a resin called BisGMA, made from BPA. The resin hardens under a curing light. Even after curing, a small amount of BPA can leach out of the surface for a few days, especially while you eat or drink.
The amount drops fast. After the first week, most fillings are basically stable.
What the research says
A 2026 study in Polymers (Basel) tested newer composite fillings for BPA leaching over time. The biggest release happened in the first 24 hours, with the levels falling by day seven. Fillings cured longer with the dentist's light leached less than rushed cures.
The team flagged the spike as small for adults but worth watching for kids and pregnant women, who are more sensitive to BPA in short bursts.
If you have a choice, ask your dentist about BPA-free or low-BPA composites. For pregnant women and kids, schedule fillings when you can take it easy on coffee, alcohol, and very hot drinks for a few days. Brush gently around fresh fillings, and don't crunch ice or hard candy in the first week.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Bisphenol-A Release from Modern Resin-Based Dental Composites: A Time-Dependent In Vitro Assessment. | Polymers (Basel) | 2026 |
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