Sealants are a thin plastic coating that is bonded into the natural grooves of a permanent tooth to help prevent tooth decay. While sealants are durable, they are not permanent. They offer a cost-effective, preventative step to reduce the chances of tooth decay on the chewing surfaces of molars. However, they do not replace the need for regular brushing and flossing. During your regular dental visits every 6 months, the dentist or dental hygienist will check the condition of the sealants to ensure they are still intact.