A dentist's drill is a dental instrument that is commonly used to remove plaque, cavities, and decayed teeth. Synonyms for the word dentist's drill include dental drill, handpiece, rotary drill, and dental handpiece. The dental drill is a small, handheld device that can be operated by either the dentist or dental hygienist to treat dental problems. The rotary drill allows the dental professional to work quickly and efficiently, making it an important tool in the dental industry. Regardless of what you choose to call it, there's no denying the importance of the dentist's drill in modern dental practices.