Dentists usually work in offices. They wear masks, gloves, and safety glasses to protect themselves and their patients from infectious diseases.
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Most dentists work full time. Some work evenings and weekends to meet their patients' needs. The number of hours worked varies greatly among dentists. It is common for dentists to continue in part-time practice well beyond the usual retirement age.
Source: Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2012-13 Edition