Because of the likelihood of developing decay in the depressions and grooves of the premolars and molars, children and teenagers are obvious candidates for sealants. However, adults without decay or fillings in their molars can also benefit from sealants.
Typically, children should get sealants on their permanent molars and premolars as soon as these teeth come in. In this way, the sealants can protect the teeth through the cavity-prone years of ages 6-14.
Dr. James L. Johnson