Teething is a celebrated milestone in a baby's life. The process starts while your baby is still in the womb, where he or she develops tooth buds which become the foundation for those baby teeth.
Baby teeth usually erupt between 4 and 15 months. If your child does not have a tooth by 18 months, he or she should see a dentist. Baby teeth are usually thinner and whiter than adult teeth. By the age of three, children usually have a full set of teeth (20!). Permanent teeth come in around age 5-7 years and the transition is usually complete by 13-14 years old.