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Definition of Oral hygiene
1. Noun. The practice of keeping the mouth clean in order to prevent cavities (dental caries), gingivitis, periodontitis, bad breath (halitosis), and other dental disorders. ¹
¹ Source: wiktionary.com
Medical Definition of Oral hygiene
1. The practice of personal hygiene of the mouth. It includes the maintenance of oral cleanliness, tissue tone, and general preservation of oral health. (12 Dec 1998)