4

Probably this, from Magen Avraham 11:18: כ' בשל"ה ומט"מ שאל יחתוך בסכין אלא ינשכם בשיניו ע"ש: Shaloh and Mateh Moshe say that you shouldn't cut [the tzitzis strings] with a knife, but bite them with your teeth; see there.


1

I heard in a shiur that wearing Tzitzit helps reduce toothaches and teeth pains


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