Teeth

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Old English tōth (plural tēth ), of Germanic origin; related to Dutch tand and German Zahn, from an Indo-European root shared by Latin dent-, Greek odont- .

wiktionary

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From Middle English teth, plural of tothe, from Old English tēþ, nominative plural of tōþ, from earlier *tœ̄þ, from Proto-Germanic *tanþiz, nominative plural of *tanþs, from Proto-Indo-European *h₃dóntes, nominative plural of *h₃dónts.

etymonline

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teeth (n.)

plural of tooth (n.). In reference to laws, contracts, etc., "power of enforcement," from 1925. To be armed to the teeth is from late 14c.