- halitosis – chronic bad breath, generally caused by an 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
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