What upper body muscles are used to brush teeth?

Brushing teeth primarily engages the muscles of the shoulder, including the deltoids and rotator cuff muscles, as well as the upper back muscles such as the trapezius and rhomboids for stability. The biceps and triceps in the arms are also activated to facilitate the brushing motion. Additionally, the forearm muscles play a crucial role in controlling the toothbrush's movement. Overall, brushing teeth involves a coordinated effort of several upper body muscle groups.