Q. Is it permissible to use mouth wash that contains a percentage of alcohol?
A. Due to the fact that there is a high possibility of some of the above entering the throat, it is highly advisable that it should not be used. However, it would not be impermissible if one uses it (that is, the above type of mouth wash) and ensures that none of it goes down the throat.
And Allah knows best.
Mufti Waseem Khan