Mouthwash

Mouthwash, mouth rinse, oral rinse, or mouth bath is a liquid which is held in the mouth passively or swilled around the mouth by contraction of the perioral muscles and/or movement of the head, and may be gargled, where the head is tilted back and the liquid bubbled at the back of the mouth.

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Sayyid Muhammad Rizvi, Sayyid Muhammad Rizvi went to the Hawza-e ‘Ilmiya-e Qum, Iran where he attended the dars-e kharij lectures of Ayatullah Wahid Khurãsãni. He also obtained an MA degree in History in 1991 from Simon... Answer imported 3 years ago

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.