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Is teeth's a word? Would you say my teeth's enamel is coming off, or my tooth enamel is coming off?

closed as off-topic by anongoodnurse, Kris, Robusto, aedia λ, Kristina Lopez Feb 5 '14 at 19:09

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    Teeth is the plural form. Are you looking for something else, the possessive form perhaps? – Bradd Szonye Feb 5 '14 at 0:40
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    "Teeth" is plural. "Teeth's" is possessive. "Tooth enamel" sounds more natural, but one could equally say "teeth's enamel" (plural) or "tooth's enamel" (singular). – nxx Feb 5 '14 at 0:41
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    This question may be asked on English Language Learners – Kris Feb 5 '14 at 6:31
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Teeth is the plural. Tooth is the singular.

Teeth's is the possessive plural and Tooth's the singular possessive. This is one way to form the genitive, the other being through of ("my tooth's enamel", "the enamel of my tooth").

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    Or, as the OP was trying to say, "the enamel of my teeth". – MPW Feb 5 '14 at 4:21
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Either way it would be awkward. You have correctly noted that the plural of tooth is teeth. As such it should have been

*My teeth' s enamel …

However, we do not say tooth's enamel or teeth's enamel. Instead, we say

The enamel on my teeth …

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