Other dentists practice in one of eight specialty areas. Orthodontists, the largest group of specialists, straighten teeth. The next largest group, oral and maxillofacial surgeons, operate on the mouth and jaws. Dentists wear protective garments to avoid transmission of diseases. Most dentists work 4 or 5 days a week.
Some dentists work evenings and weekends to meet their patients' needs.
Younger dentists may work fewer hours as they build up their practice, while established dentists often work fewer hours as they grow older. A considerable number continue in part-time practice well beyond the usual retirement age. Most dentists are solo practitioners, that is they own their own businesses and work alone or with a small staff. Some dentists have partners, and a few work for other dentists as associate dentists. Dentists wear masks, gloves, and safety glasses to protect themselves and their patients from infectious diseases like hepatitis.