Q. See question 3240 above. Can one use a bit of mouthwash while brushing during a Ta’anis Tzibur ? Is it better than water?
A. Some Poskim prefer the use of mouthwash over water, when it is permitted in need during brushing in a Ta’anis, since one does not usually drink it.
However, Horav Shlomo Miller’s Shlit’a opinion is that it is the same.
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a