It is brought down in Taamei Haminhagim that Kiddush Levana helps against a tooth ache. How and why? Maybe, we say there that my enemies should not do bad to me. We find in the Haggadah a hint on hakheh es shinov. When we remove shinov gematria (366) from rasha (570), we get tzadik (204). So we are saying at kiddush levana that it should be a zechus for us to make us a tzadik and not need the operation to weaken our teeth.
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