Leawood Family Dental - Sealants As children’s permanent teeth start to come in, a reliable preventative treatment is to place a tooth colored covering over the chewing part of the tooth. This will help to prevent early cavities on teeth they will have the rest of their lives. The dentist may choose to seal both the 6 and 12-year molars depending on your child’s individual needs. The best way to avoid a problem is to prevent it!