Dentists and Dentistry - As enacted, generally prohibits a licensed dentist from allowing, under general supervision, more than three dental hygienists to work at any one time; authorizes a dentist to supervise, under direct supervision, no more than 10 dental hygienists while the dentist and each hygienist are providing dental services on a volunteer basis through a nonprofit provider of free mobile clinics; authorizes a dentist to supervise, under general supervision, no more than five dental hygienists if the dentist and dental hygienists work for the department of health, a county or metropolitan health department, or an entity that participates in the state safety net program for the uninsured. - Amends TCA Section 63-5-108.