Answered by Shaykh Faraz Rabbani
I went to the dentist. They operated on my teeth, and told me I cannot rise my mouth for a day or maybe even two. How do I get around this for wudu?
In the Name of Allah, Most Merciful and Compassionate. May His abundant blessing and most perfect of peace be on His Beloved Prophet, the best of creation, and his family, companions and followers.
It is sunna (not obligatory) to wash the mouth in wudu–when there is an excuse, it is permitted to leave without it being blameworthy.
As for ghusl:
If they were an upright Muslim, you can take their word for it, and leave washing your mouthan obligatory act of ghusland your ghusl will remain valid. This is because washing your mouth would be considered undue hardship, and such hardship has been lifted by Allah Most High.
If non-Muslim, if you are reasonably sure yourself that washing your mouth could be harmful, you can leave it, and your ghusl would be valid as well. It would be good to explain to them that when you perform ritual baths (ghusl), it is expected that you wash out your mouthask whether this could be harmful
And Allah alone gives success.
Wassalam,