{"hq_id":"hq-p-bdy-000172","name":"BPA Dental Sealants — Bisphenol A Leaching from Bis-GMA Resin, Pediatric Endocrine Disruption Concern (Pit-and-Fissure Sealants, Saliva BPA Levels)","category":{"primary":"oral_care","secondary":"dental_sealant","tags":["BPA","bisphenol A","dental sealant","Bis-GMA","endocrine disruptor","pediatric","pit and fissure","resin"]},"product_tier":"BDY","overall_risk_level":"low","description":"Dental pit-and-fissure sealants are resin coatings applied to the occlusal surfaces of children's permanent molars to prevent caries — one of the most effective preventive dental interventions, reducing caries by 80% in the first 2 years (Cochrane review). The vast majority of sealants are based on Bis-GMA (bisphenol A glycidyl methacrylate), synthesized from bisphenol A (BPA). BPA leaches from sealants into saliva, with studies detecting salivary BPA concentrations of 5-30 ng/mL in the first hour after placement, declining to baseline within 24 hours as the surface monomer layer is consumed. The concern is pediatric endocrine disruption: BPA is an established estrogen receptor agonist, and children receiving sealants are typically 6-12 years old (permanent molar eruption age). A 2012 study in Pediatrics associated dental sealants with increased BPA exposure, though the clinical significance of transient salivary BPA from sealants versus continuous dietary BPA exposure remains debated. The ADA continues to recommend sealants, noting the caries-prevention benefit substantially outweighs the minimal, transient BPA exposure.","synthesis":{"derived_risk_level":"high","synthesis_confidence":0.88,"synthesis_method":"compound_composition","context_used":"human_child","context_source":"product_users","exposure_modifier":1,"vulnerability_escalated":true,"escalation_reason":"Child exposure group","compounds_resolved":1,"compounds_total":1,"synthesis_date":"2026-03-27","synthesis_version":"1.0.0"},"hazard_summary":{"sensitive_populations":"children 6-12 (primary sealant recipients, endocrine development period), children with multiple sealants placed in one visit","overall_risk":"low","primary_concerns":["BPA is an established endocrine disruptor with estrogenic activity","Pediatric population is the primary recipient (ages 6-12, hormonal development stage)","Transient salivary BPA spike to 5-30 ng/mL in first hour post-placement","Multiple teeth sealed in one visit increases cumulative transient exposure"],"exposure_routes":"Oral mucosal (direct contact with Bis-GMA sealant surface). Ingestion (saliva containing leached BPA, primarily in first 24 hours)."},"exposure":{"routes":["ingestion","oral_mucosal"],"contact_types":["ingestion_incidental","oral_mucosal_direct"],"users":["child","adolescent"],"duration":"acute_transient","frequency":"single_event_per_tooth","scenarios":["Child: salivary BPA peak in first hour after sealant placement (5-30 ng/mL)","Repeated exposure: multiple teeth sealed in one visit increases cumulative transient BPA","Surface monomer: unpolymerized Bis-GMA on fresh sealant surface is primary BPA source","Long-term: minimal BPA release after initial 24-hour surface layer is worn away"],"notes":"Bis-GMA (bisphenol A glycidyl methacrylate): primary monomer in dental sealants and composite resins. BPA is a synthesis byproduct and hydrolysis product, not an ingredient per se. Salivary BPA: Kingman et al. 2012 (Pediatrics) detected BPA in saliva and urine following sealant placement. Levels: 5-30 ng/mL saliva in first hour, declining to <1 ng/mL by 24 hours. Comparison: dietary BPA exposure from food packaging is typically 0.1-1 ug/kg/day (continuous). ADA position: 'The benefits of dental sealants in preventing tooth decay outweigh any potential risk associated with BPA exposure.' Mitigation: wiping sealant surface with cotton after curing removes 88-95% of unpolymerized monomer layer."},"consumer_guidance":{"usage_warning":"The ADA and CDC recommend dental sealants for children — caries prevention benefit (80% reduction) substantially outweighs transient BPA exposure risk. Ask your dentist to wipe the sealant surface with a cotton pellet and rinse after curing — this simple step removes 88-95% of unpolymerized surface monomer and dramatically reduces salivary BPA. If BPA is a concern, ask about BPA-free sealant alternatives (glass ionomer, giomer-based products).","safer_alternatives":["Glass ionomer sealants (fluoride-releasing, BPA-free, lower retention rate)","Giomer-based sealants (pre-reacted glass ionomer in resin, lower BPA)","BPA-free composite sealants (silorane-based or ormocer-based resins)","Surface wiping protocol after Bis-GMA sealant curing (removes 88-95% of surface BPA)"]},"regulatory":{"applicable_regulations":[{"jurisdiction":"USA","regulation":"FDA Class II Medical Device — Pit and Fissure Sealants (21 CFR 872.3250)","citation":"21 CFR 872.3250; FDA 510(k) clearance pathway","requirements":"Dental sealants are FDA Class II medical devices requiring 510(k) premarket notification. No specific FDA limit on BPA content in dental materials. California Proposition 65 lists BPA as a reproductive toxicant (2015). ADA recommends sealant application for all children as a standard-of-care preventive measure.","compliance_status":null,"effective_date":null,"enforcing_agency":"FDA Center for Devices and Radiological Health","penalties":null,"source_ref":null}],"certifications":[],"labeling":{"required_disclosures":[],"prop65_warning":{"required":null,"chemicals":[],"endpoint":null,"notes":null},"ghs_labeling":{"required":null,"signal_word":null,"pictograms":[],"hazard_statements":[],"notes":null},"hidden_ingredients":{"trade_secret_protected":null,"categories_hidden":[],"estimated_count":null,"known_concerns":null,"notes":null},"notes":null},"recalls":[],"regulatory_gap":null,"notes":null},"lifecycle":{"recyclable":false,"disposal_guidance":"Sealants are permanently bonded to tooth enamel. No disposal needed — wear naturally over 5-10 years.","hazardous_waste":false,"expected_lifespan":"5-10 years clinical retention; reapplication if lost"},"formulation":{"form":"varies","key_ingredients":[],"certifications":[]},"materials":{"common":[],"concerning":[],"preferred":[]},"compound_composition":[{"hq_id":"hq-c-org-000006","compound_name":null,"role":"leachable_monomer","typical_concentration":"BPA detected in saliva at 5-30 ng/mL for first hour post-placement; declines to baseline within 24 hours"}],"identifiers":{"common_names":["bpa dental sealants — bisphenol a leaching from bis-gma resin, pediatric endocrine disruption concern (pit-and-fissure sealants, saliva bpa levels)"],"aliases":[],"manufacturer":null,"brands":[]},"brand_examples":[],"sources":[{"type":"expert_curation","name":"ALETHEIA Safety Database","date":"2026-03-26"}],"meta":{"schema_version":"4.0.0","last_updated":"2026-03-26","timestamp":"2026-05-02T18:16:24.513Z"}}