Sealants are placed on the chewing surfaces of back teeth to prevent cavities from starting in the bumpy, irregular chewing surfaces.  The sealants are usually placed by the dentist when the 6 year molars come in and again when the 12 year molars come in.  Some patients need sealants at other stages of their life due to diet or poor enamel.  Quick and painless, sealants help children avoid fillings and toothaches.