Final answer:
The first upper premolars commonly have two roots and are used for mashing food in the process of digestion.
Step-by-step explanation:
The first upper premolars, also known as bicuspids, typically have two roots. These teeth are located posterior to the cuspids (canines) and are characterized by their flatter shape with two rounded cusps, which are useful for mashing foods. Each person has 8 premolars in their permanent dentition, with 4 located in the upper jaw and 4 in the lower jaw. The structure of premolars is designed to efficiently process food after it has been torn by canines and before it reaches the molars for final crushing.