A dentist is a doctor who specializes in teeth, gums, and the mouth. If you get a bad toothache, you should probably go to the dentist to make sure you don't have a cavity.
When you visit the dentist, you might have your teeth and gums examined and cleaned, or you may need surgery for an impacted wisdom tooth or x-rays to make sure you don't have cavities. Dentists are health care professionals who attend dental school and train for several years before practicing. Dentist comes from the French dentiste, from dent. or "tooth."