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We had something like that in my country too... Nobody that I know believed it, but we had a song about it.

Translating lyrics to English:

"O Sun my Little Sunny ... Take my Little Toothy ... O Give me a new toothy ... So I could eat sugary cake"

I think we share a lot of superstitions. And that's crazy! You must have believed it as a kid, too.

I never believed this one, I believe I was taught that teeth grow by themselves "one time" in your life.