Dental sealants are basically a thin, plastic liquid that is hardened in the grooves of teeth to help prevent cavities. Designed to “seal off” the cavity-prone grooves (the grooves are where most cavities form on the tops of teeth), they help to prevent the formation of cavities by keeping plaque and germs out of the microscopically rough grooves. The sealant is additive in nature, so nothing is removed. When placed properly under a bone-dry field (such as when using an Isolite® isolation system), a sealant can last for up to a decade. When it eventually wears out, it can very readily be replaced with yet another sealant! Great stuff for proactive, minimally invasive dentistry. In the ideal world, EVERYONE gets their back teeth sealed!