We found one dictionary that defines the word teethful:

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1. teethful: Wiktionary

Definitions from Wiktionary (teethful) ▸ adjective:  Toothy; showing the teeth. ▸ Words similar to teethful ▸ Usage examples for teethful ▸ Idioms related to teethful ▸ Wikipedia articles (New!) ▸ Popular nouns described by teethful ▸ Words that often appear near teethful ▸ Rhymes of teethful ▸ Invented words related to teethful