In adults, dentists can apply sealants on molars that have early signs of tooth decay, as long as the decay has not broken through the enamel. Once the enamel has been irreversibly compromised, your dentist will have to fill the tooth. In more serious cases, a root canal may be necessary.
In children, both baby molars and permanent molars can be sealed. Dentists can also apply fluoride varnish on both primary and permanent teeth to protect them from decay.