Tooth Tooth eruption
Children have 20 teeth. When these teeth erupt it can hurt. Babies chew on things to make the pain better. Most children have all 20 teeth by 2 or 3 years of age. At age 6-7 the 'permanent' teeth start to erupt. By the age of 11-12 most children have 28 adult teeth. The last 4 teeth, called 'wisdom teeth' or 'third molars' come in by age 17-21 in most people. Some people never grow wisdom teeth.