ABC's periodontics: "O" is for oral habits.
D002012:Bruxism / Q000150:complications*; D005386:Fingersucking / Q000150:complications; D006801:Humans; D010510:Periodontal Diseases / Q000209:etiology*; D014061:Tongue Habits; D014099:Toothbrushing / Q000009:adverse effects*