Halitosis

Bad breath of oral or gastrointestinal origin

Heimlich Maneuver

Technique employed by rescuer for obstruction of victim's airway

Hematoma

Swelling of effused blood beneath tissue surface

HMO or DMO

Health (dental) maintenance organization which specifies a health care (dental) provider a patient may see. Profitability depends on minimization of treatment.

Hydrogen Peroxide

Disinfecting solution used in dental irrigation procedures or as mouth rinse

Hygienist

Dental auxiliary who cleans teeth and provides patient education; administers local anesthetic, nitrous oxide and performs periodontal scaling

Hyperemia

Increased blood flow; may cause dental sensitivity to temperature and sweets; may precede an abscess