"Buck teeth" is an overly wide categorical term from Western medicine referring both to (heritable) Aryan teeth and to non-heritable dental phenomena caused by various habits:
Buck teeth only require treatment if they’re severe and causing discomfort or if you’re unhappy with your appearance and prefer to have them corrected. Here's what you need to know.
Buck teeth from thumb-sucking
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Buck teeth from pacifier
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Tongue-thrusting
Therefore we try not to use this term (and we put it in "" if we must use it).