A Pesach preparation guide tells me to kasher my teeth on Erev Pesach.

How on earth does one do this?

  • 4
    By brushing them to make sure crumbs of hametz are gone?
    – mbloch
    Apr 19, 2016 at 6:08
  • 3
    R Moshe Bick IINM, when a questioner insisted he wanted the "real" answer and not just Kulas, instructed someone to pour boiling water in his mouth, and "when you start screaming, it's kosher".
    – Double AA
    Apr 19, 2016 at 6:19
  • 2
    Hachay eino bolea but prothesis yes. Kebolo Kach polto. The or coffee warm and waiting 24 h without warm hamets.
    – kouty
    Apr 19, 2016 at 8:37
  • 3
    The real question is what to use for false teeth or fillings. This is not a pesach shaala but one for the whole year since you eat milk and meat with them. One should use a material that is not "bolea". In other words not metal teeth. A mouth doesnt always use "klai shaini" since it sometimes eats a "gush" which is treated like "klai rishon". I think the munkats darkai tshuva discusses this
    – newcomer
    Apr 19, 2016 at 9:14
  • 6
    It is downright irresponsible for a practical guide to say "kasher your teeth" without elaboration.
    – Isaac Moses
    Apr 19, 2016 at 12:56

1 Answer 1


Per Rabbi Yehuda Spitz on Ohr.edu based on a letter written by Rabbi Shlomo Zalman Aurbach to the Chazon Ish regarding teeth & dentures any food that remains in the mouth becomes repulsive and Pagum. He goes on to say that it is best not to eat any Chometz 24 hours prior and to drink a hot cup of water prior to Pesach, and that a proper oral cleaning is enough per Halacha.

  • "proper oral cleaning" - So, I should go to the dentist on Erev Pesach? Doesn't some fluoride have chametz in it, which is why I see many people buy KP toothpaste?
    – DanF
    Apr 19, 2016 at 15:11
  • @DanF: I have never heard that fluoride is Chametz. A quick look on the internet seems to say that fluoride is fine for Pesach. The only issue I saw was regarding using fluoridated water with Matza as it may make the dough rise quicker. Kosher L'Pesach toothpaste such as ADWE has fluoride in it. Apr 19, 2016 at 15:29
  • 1
    Your answer can easily be misunderstood meaning that even when only natural teeth such a pressigure is nessisery
    – hazoriz
    Apr 19, 2016 at 15:51
  • Dont forget that a dovor charif like whisky if you drink during the 24 hours can make it "lishvach"
    – newcomer
    Apr 19, 2016 at 16:54
  • 1
    I remember something read in Shaare Dura A baal Tosfot have a dream that he eat chamets, after maasse he understand that was because there was chamets in a hole into a tooth
    – kouty
    Apr 19, 2016 at 16:55

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