Dentistry is a branch of medicine that deals with the prevention, diagnosis and treatment of diseases and disorders of the oral cavity. This includes the teeth, gums, tongue, cheeks and lips. Dentists are trained to provide care for patients' teeth and gums, as well as perform surgical procedures on the mouth and jaw area. They also focus on preventative measures such as regular check-ups, cleanings, and oral hygiene education to help maintain good dental health.