The best way to avoid cavities is by eating right, brushing with a fluoridated toothpaste, flossing daily and visiting your dentist every six months. Children and some adults can benefit by having Sealants placed. Some say at 1 year of age, but definitely by the child's 3 rd birthday. Place the tooth in cool milk or if the child is old enough, under the child's tongue. Be real careful not to swallow the tooth and get to the dentist within 30 minutes so it can be reimplanted.
Teeth erupt at different times in all individuals .
Your child's tooth should erupt eventually unless your dentist tells you that there is no replacement permanent tooth.