Dentistry is a specialty in medicine, which is practiced by a dentist. Dentists find out what's wrong, fix, and help prevent problems with teeth. A dentist has other people that help him with their job. Dental hygienists help people keep their teeth clean. A dental assistant helps the dentist when they are treating a patient. Dental surgeons will perform surgery to fix large or dangerous problems with people's teeth. There are also dentists called orthodontists, who can move people's teeth using braces. Dental surgeons and orthodontists are called specialists.