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Brushing Teeth on Shabbat: Difference between revisions

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The toothpaste becoming more foamy and fluid may be a problem of [[molid]]. Molid is the rabbinic prohibition of creating a new substance (or more precisely, changing the form of a substance), which is based on the gemara (Shabbat 51a) that prohibits crushing ice into water on shabbat.<ref>This is based on Rashi's interpretation of the gemara there that turning the ice into water is "דמי למלאכה, שבורא המים האלו" - it is similar to creative labor since you are creating the water. Other rishonim understand this gemara as being a narrow decree limited to not squeezing ice into water, lest one come to  [[Squeezing|squeeze]] fruit for their juice and thereby violate [[sechita]]. See Rambam Mishneh Torah Hilchot [https://halachipedia.com/Shabbat Shabbat] 21:13. According to these rishonim, there would thus be no source for a rabbinic prohibition of molid.  
The toothpaste becoming more foamy and fluid may be a problem of [[molid]]. Molid is the rabbinic prohibition of creating a new substance (or more precisely, changing the form of a substance), which is based on the gemara (Shabbat 51a) that prohibits crushing ice into water on shabbat.<ref>This is based on Rashi's interpretation of the gemara there that turning the ice into water is "דמי למלאכה, שבורא המים האלו" - it is similar to creative labor since you are creating the water. Other rishonim understand this gemara as being a narrow decree limited to not squeezing ice into water, lest one come to  [[Squeezing|squeeze]] fruit for their juice and thereby violate [[sechita]]. See Rambam Mishneh Torah Hilchot [https://halachipedia.com/Shabbat Shabbat] 21:13. According to these rishonim, there would thus be no source for a rabbinic prohibition of molid.  


The Shulchan Aruch (OC 318:16) paskens leniently, that one is allowed to place fully cooked solid food close to a fire, even though the congealed fats will melt into liquid. However, the Rema ibid. rules stringently, that one should not place the solid food near the fire in a way that will cause it to liquify, except in cases of need.
The Shulchan Aruch (OC 318:16) paskens leniently, that one is allowed to place fully cooked solid food close to a fire, even though the congealed fats will melt into liquid. However, the Rema rules stringently, that one should not place the solid food near the fire in a way that will cause it to liquify, except in cases of need.


This same machloket applies to the permissibility of using a bar of soap. Shulchan Aruch (326:10) permits it, but the Rama there forbids it because of [https://halachipedia.com/Molid molid], since the solid bar of soap will liquify through use.</ref>  
This same machloket applies to the permissibility of using a bar of soap. Shulchan Aruch (326:10) permits it, but the Rama there forbids it because of [https://halachipedia.com/Molid molid], since the solid bar of soap will liquify through use.</ref>  
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===Sechita===
===Sechita===
Brushing one's teeth may be a problem of [[Dosh|sechita]] (lit: squeezing), since in the process of brushing, one squeezes absorbed water out of the bristles.<ref>The Gemara ([[Shabbat]] 128b) says that there's no problem of sechita in hair - אין סחיטה בשער, presumably since it doesn’t absorb. Rambam ([[Shabbat]] 9:11) paskens this gemara. However, the [[Maggid]] Mishnah ibid says that it is still asur derabbanan. It is unclear where exactly the Maggid Mishnah knew this from. Presumably, the rationale is that there is a rabbinic decree not to squeeze hair, even though it doesn't absorb, lest you come to squeeze something else which does absorb. Kesef Mishnah on Rambam 2:11 seems to concur with this ruling of the Maggid Mishnah. See also Mishna Brurah siman 330 s.k. 7. Since l'halacha we hold that one is prohibited from squeezing out hair, despite it's being relatively non-absorbant, there is thus reason to suspect that this gezeira drabanan would apply by a tooshbrush as well.</ref>  
Brushing one's teeth may be a problem of [[Dosh|sechita]] (lit: squeezing), since in the process of brushing, one squeezes absorbed water out of the bristles.<ref>The Gemara ([[Shabbat]] 128b) says that there's no problem of sechita in hair - אין סחיטה בשער, presumably since it doesn’t absorb. Rambam ([[Shabbat]] 9:11) paskens this gemara. However, the [[Maggid]] Mishnah says that it is still asur derabbanan. It is unclear where exactly the Maggid Mishnah knew this from. Presumably, the rationale is that there is a rabbinic decree not to squeeze hair, even though it doesn't absorb, lest you come to squeeze something else which does absorb. Kesef Mishnah on Rambam 2:11 seems to concur with this ruling of the Maggid Mishnah. See also Mishna Brurah siman 330 s.k. 7. Since l'halacha we hold that one is prohibited from squeezing out hair, despite it's being relatively non-absorbant, there is thus reason to suspect that this gezeira drabanan would apply by a tooshbrush as well.</ref>  


# Rav Moshe thinks that one should not wet the brush with water before use.<ref>Igros Moshe (OC 1:112). He is concerned that if the brush is wet, then during use you will squeeze out some of the water and thereby violate the isur drabanan of שחיטה בשיער. See above section on memareach, where we cite Rav Moshe's position that using toothpaste is also forbidden. </ref>
# Rav Moshe thinks that one should not wet the brush with water before use.<ref>Igros Moshe (OC 1:112). He is concerned that if the brush is wet, then during use you will squeeze out some of the water and thereby violate the isur drabanan of שחיטה בשיער. See above section on memareach, where we cite Rav Moshe's position that using toothpaste is also forbidden. </ref>
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