the root for "tooth" is -odont-
------------- are there other , similar O- words in Ancient Greek ?
https://en.wiktionary.org/wiki/Reconstruction:Proto-Indo-European/h%E2%82%83d%C3%B3nts#Etymology
> This noun is usually reconstructed with the initial *h₁ and thus explained as active participle of the verb *h₁ed- (“to eat”).
( ... advanced gibberish ...)
> Thus, the word is ultimately an active participle of the root *h₃ed- (“to bite”) + *-ónts.
Suffix *(Ø)-ónts m ------- Derives nouns denoting body parts.