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There are several of the 39 melachas that are at risk of being committed if you brush your teeth in a normal way. A summary are: Smoothing the teeth. This is disputed and some say is not an issue. Kneading (I think) if you take solid toothpaste and liquify it. So one should liquify the toothpaste before Shabbat or buy an already liquid one. Extracting ...


With regard to using toothpaste, I believe Rav Moshe Feinstein ruled that there was a concern of memareyach (smoothing) though i think I heard that Rav Yisrael Belsky said he was misled regarding the physical reality and that this should not in fact be a concern since there is no significant residue that remains on the teeth. Additional concerns have been ...

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