On the chewing surface of the baby and adult molars are pits and fissures, which are normal imperfections of these teeth.
Food and germs often become trapped in these areas, and a cavity can easily happen because brushing and fluoride are not effective protection against cavities of the pits and fissures. Only sealants are effective protection against decay of these surfaces because they fill in these areas.
A sealant is a clear or white resin coating that is applied to the cavity-prone grooves of the back teeth to protect and minimise against decay. The sealant is set hard using a curing light. This is usually done around the ages of 6-7 and over.