This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Third-person singular simple present indicative form of teethe.

"Sometimes, I get horribly stressed about what other people might think of my novel (what if those big-name writers who get my ARCs just laugh at them, and not because the book is a comedy?), or I feel unbearably exhausted after weeks of bad nights as my baby teethes."

teethed    teethes    teething   

acquire    get    grow    develop    produce   

breathe    seethe    sheathe