Premolars are just as their name indicates; located before the molars. The are considered transitional teeth, guiding food from the cuspids back to the molars for chewing. Humans have eight premolars, two in each dental quadrant. The first premolar arrives around age nine, with the second premolar following around age ten.
The anatomy of a premolar is similar to that of the first and second molars, although they are considerably smaller in comparison. Premolars have one to two roots firmly implanted in the bone for stabilization.
First or 1st Bicuspid
Second or 2nd Bicuspid
First or 1st Premolar
Second or 2nd Premolar