What is metal mouth?

Answer:
Someone with braces.

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braces - the metal ones.

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person with metal braces

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The only time I have heard that is as a quasi-insult to someone with metallic braces on their teeth.

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I know this one too well, lots of friends called me this with my braces for my teeth. I wore them all the way through high school. Just think how much fun that was at a freshman in high school. hahaha

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Metal mouth - someone who is wearing a braces where in the brackets are made of stainless steel or titanium but not ceramic.

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slang term for someone who wears braces.

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someone with metal braces or a mouth filled with silver fillings, and or silver crowns

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