Healthy Teeth for Life: 8 Tips for Families 1.Start children early. Dental care should begin as soon as a child’s first tooth appears, usually around six months. At about age 2, you can let kids try brushing for themselves – although it’s important to supervise. 2. Seal off trouble. Permanent molars come in around age 6. Thin protective coatings applied to the chewing surfaces of the back teeth, called Sealants, can significantly reduce caries. Talk to your dental professional.