Teeth begin to form before birth and continue to do so throughout childhood. Each person has five different types of teeth: central incisor (front two upper and bottom teeth), lateral incisor (two teeth next to the upper and bottom front two teeth) canines (the pointy teeth) first molars (bottom and upper teeth in the back) and second molars (bottom and upper teeth located in the very back of your mouth). All of these various types of teeth look different from one another because they are designed to do different things.