halitosis

Chronic bad breath, generally caused by oral or gastrointestinal disorder.

hematoma

Blood swelling beneath the surface of the skin, gums, or other tissue.

hygienist

Dental professional who is trained and certified to perform dental cleanings, scaling and root planing, and other functions, provides patient education, and may administer local anesthetic or nitrous oxide.

hyperplasia

Abnormal increase in cell growth leading to enlargement of tissue.