Final answer:
The molars are the most posterior teeth in the mouth, used primarily for crushing and grinding food.
Step-by-step explanation:
The most posterior teeth in the mouth are the molars. Molars are the large teeth located at the back of the mouth, known for their role in crushing and grinding food. There are 12 molars in total, including the wisdom teeth, which are the farthest back in the mouth and sometimes do not erupt properly and need to be removed. Other types of teeth include the incisors, canines, and premolars, but these are more anterior compared to the molars.