The first, second, and third |molars |(tricuspids) are located at the back of the |mouth| behind the |premolars |(bicuspids). The crown of each molar features three raised prominences (cusps) which facilitate the grinding and chewing of food (hence the term "tricuspid"). The first and second molars are represented by deciduous (non-permanent) counterparts in the child, though the third molar (also called the "wisdom tooth") is not and does not usually erupt until the ages of 18-20. In many people, one or more of the third molars never erupts, leaving 31,30,29, or even 28 |teeth| total. The first and second molar roots feature multiple root stems which anchor them in the |maxilla| and |mandible| - the upper ones usually have three, while the lower ones have two. The third molars have what appears to be fused-pair root systems. The root stems may differ, with the possibility of serious dental repair being necessary to correct any malformed root structures.
