protruding tooth; fang-like tooth
Refers to a tooth that sticks out prominently, often compared to a demon's fang. Can be used for both natural dental features and exaggerated descriptions.
When she smiles, her protruding tooth shows a little.
I'm self-conscious about my fang-like tooth and considering orthodontics.
Compound of 鬼 (oni, 'demon') and 歯 (ha, 'tooth'), with rendaku voicing of は to ば. The word likely arose from the visual resemblance of a protruding tooth to a demon's fang.