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General product and regulatory information only, not dental or medical advice. Decisions about any individual patient belong to a licensed dental professional.
Short answer
A pit and fissure sealant is a dental device, regulated by the US FDA as Class II under 21 CFR 872.3765, that seals the grooves (pits and fissures) in the biting surfaces of teeth to prevent cavities. The ADA describes four material families: resin-based, glass ionomer, polyacid-modified resin and resin-modified glass ionomer. The ADA/AAPD guideline found insufficient evidence to prefer one over another.
Definition and scope
The FDA classification regulation defines the device as a pit and fissure sealant and conditioner “composed of resin, such as polymethylmethacrylate, intended for use primarily in young children to seal pit and fissure depressions (faults in the enamel) in the biting surfaces of teeth to prevent cavities.” The same section classifies it as Class II (21 CFR 872.3765, eCFR text checked 2026-10-31).
The ADA describes dental sealants as systems that can be applied to the occlusal (chewing) surfaces of teeth, penetrate anatomic surface pits and fissures and form a physical barrier on the tooth surface (ADA, Dental Sealants, checked 2026-10-31). The ADA/AAPD guideline cited on that page addresses sealants on the occlusal surfaces of primary and permanent molars in children and adolescents.
Two points of scope matter for anyone reading product literature. First, the regulation covers the sealant and its conditioner together as one device type, so product listings may bundle them. Second, the regulation text names resin as the composition, while the ADA page also covers glass ionomer based materials; the regulation is an identification of the device type, and the ADA page is the source for the material families below.
How it is used in practice
The ADA states that sealants are generally supplied as a liquid that sets on the tooth, either chemically or by light activation, and that they must be fluid enough to wet the tooth and flow into the pits and fissures. This page does not give clinical technique; chairside application belongs to the manufacturer’s instructions for use and to the treating dentist.
The practical consequence for supply staff is that setting method differs by material. Composite resins set by polymerization, usually started by a dental curing light, while glass ionomers set by an acid-base reaction (ADA). A clinic that stocks light-cured products therefore also depends on working curing equipment, whereas an acid-base setting product does not rely on the light for its set reaction.
Types of sealant material
| Material family (ADA wording) | How it sets (ADA) |
|---|---|
| Resin-based sealant (composite resin) | Polymerization, usually initiated by a dental curing light |
| Glass ionomer cement or sealant | Acid-base reaction |
| Polyacid-modified resin sealant (compomer) | Combination of acid-base and polymerization reactions |
| Resin-modified glass ionomer sealant | Combination of acid-base and polymerization reactions |
The ADA adds that the two mixed-reaction types produce products whose characteristics sit on a continuum between traditional glass ionomers and composite resins. The ADA/AAPD guideline panel found insufficient evidence at the time to recommend one material type over the others, so a product’s family is not by itself a ranking of quality.
Where it matters for labs, clinics and supply decisions
- Regulatory status. Sealants are a Class II device type under 21 CFR 872.3765. For how devices reach the US market, see the guide to FDA 510(k) premarket notification and the overview of FDA device classification, 510(k) and PMA pathways.
- Curing dependency. Because composite resin sets with a curing light (ADA), light-cured products and curing equipment are used together in practice.
- Operatory supplies. Sealants are a caries-prevention consumable, separate from the items in a dental office medical emergency supply checklist.
- Research context. Caries-prevention evidence of this kind is part of the field described in dental and oral health research.
Common misunderstandings
“The 73% figure means sealants cut cavities by 73% versus doing nothing.”
No. The ADA reports that, across three studies with nearly 2,000 participants, those who received sealants on occlusal surfaces had a 73% reduction in the risk of developing new caries lesions compared with participants who received only fluoride varnish. The comparator was fluoride varnish alone, not no treatment.
“The guideline proves resin is better than glass ionomer, or the reverse.”
No. The guideline panel found insufficient evidence to recommend a specific material over the others.
“The ADA page says how long a sealant lasts.”
It does not state a durability or reapplication interval, so none is given here. Product-specific information is in the manufacturer’s instructions for use.
“Sealants are only for children.”
The FDA identification says “primarily in young children,” which describes the main intended use rather than an exclusive one. The ADA/AAPD guideline cited above addresses children and adolescents. Whether a sealant suits a particular person is a question for a dentist.
FAQ
What is a pit and fissure sealant?
A dental material that seals the grooves in the biting surfaces of teeth, and the FDA device type defined in 21 CFR 872.3765.
How does the FDA classify pit and fissure sealants?
As Class II devices under 21 CFR 872.3765 (eCFR, checked 2026-10-31).
What types of sealant material exist?
Resin-based, glass ionomer, polyacid-modified resin and resin-modified glass ionomer, per the ADA. They differ in how they set.
Is one sealant material proven better than the others?
Not according to the ADA/AAPD guideline, which found insufficient evidence to favour one material.
Sources
- US FDA / eCFR, 21 CFR 872.3765, Pit and fissure sealant and conditioner: ecfr.gov/current/title-21/section-872.3765 (date checked: 2026-10-31).
- American Dental Association, Dental Sealants: ada.org dental sealants (date checked: 2026-10-31).
