What is the primary function of a disposable prophy angle?

The primary function of a disposable prophy angle is to polish teeth. This instrument is designed specifically to hold a polishing cup or brush that can be used with a polishing paste during dental cleanings. When applied to the teeth, the prophy angle helps to remove plaque and stains from the tooth surfaces, leading to a smoother, shinier finish.

In contrast, the other options represent functions related to different dental instruments. For example, removing tartar typically involves the use of hand scalers or ultrasonic scalers, which are designed to break down and remove calculus from the teeth. Trimming bone is a surgical procedure that usually requires specific instruments such as surgical bone chisels or rotary tools, while tooth extraction necessitates the use of extraction forceps or elevators, which are tailored for removing teeth from their sockets. Understanding the specific purpose of each instrument is crucial for effective dental practice and patient care.