Dental hygienists work under the supervision of licensed dentists. They are not qualified to make the same kind of diagnostic decisions or perform the same procedures as dentists. Instead, they perform basic dental care tasks, mostly focused on keeping patients' teeth and gums clean. Unlike dental assistants, who work directly with dentists, hygienists often see patients on their own and direct their own tasks. They work in close physical proximity to their patients and spend a lot of work time around other people, including patients and other office staff.