[Avodah] Mouthwash on Tisha B'Av (was: 25 hour fast)

[Doron Beckerman]

RYGB's link to his blog relates only to the achilah aspect, but does not
relate to the rechitzah aspect of using mouthwash. It is well-known that R'
Moshe Feinstein forbade using mouthwash on account of rechitzah (see R'
Eider's kitzur hilchos bein hametzarim, citing RMF to this effect).

I once heard RHS discuss mouthwash, and someone brought up RMF's psak on
rechitzah and RHS was not convinced that rechitzah is with anything but
water. However, Maaseh Rokeach to Rambam Shevisas Asor 3:1; Matteh Efraim
613:3 and the Tchebiner (Dovev Meisharim 1:124) explicitly apply Issur
rechitzah to vinegar as well. [Rashash to Yoma 73b tries to prove that
rechitzah is only with water but rejects that proof.]
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