Is it okay to use dental products, such as mouthwash and toothpaste, that contain alcohol?
Some of the mouthwash products contain up to 12% alcohol.
If dental products contain alcohol, then they become najis. If you can use it without swallowing it, then it could be permissible to use for its purpose; but if you feel that it is impossible not to swallow some of it, then it is haram for you to use it.