Fissure sealants are a preventative measure to protect teeth from decay in the un-brushable grooves. These deep grooves are mainly on the biting surfaces of pre-molars and molars. Grooves and pits can also form on the side of these teeth.
The sealant is a thin runny plastic coating that flows into the deep grooves and bonds on to
the tooth, sealing up a place that can’t be brushed or flossed.