How do I rinse my mouth in wudu while fasting?

Yes, you still rinse, but gently. Rinsing the mouth is part of wudu even when you are fasting, but the Prophet ﷺ taught us not to overdo it. Use a small amount of water, do not gargle or tilt your head back, and spit it all out so your fast stays safe.
What the Prophet ﷺ said
Laqit ibn Sabrah asked the Prophet ﷺ about wudu, and he answered: "Perform wudu well, go between the fingers, and snuff water up deeply, except when you are fasting" (Jami at-Tirmidhi 788). The hadith speaks about water going up the nose, and scholars apply the same caution to the mouth, because both lead to the throat.
So the sunnah of rinsing stays, and what changes is how forcefully you do it. See Can I brush my teeth while fasting?
How to rinse safely
- Take a small handful or sip of water.
- Swish it around your mouth lightly, with your head slightly bent forward.
- Spit all of it out straight away. Do not gargle or let it sit at the back of your throat.
- For the nose, sniff the water in gently and blow it out. Do not pull it deep.
- Use less water than usual. You can rinse once instead of three times if you feel nervous.
What if some water goes down?
This happens to many people, especially in the first Ramadan. If it was an accident during a normal, gentle rinse, many scholars say your fast is still valid, although the Hanafi and Maliki schools say to make up that day to be safe. If you gargled hard or swallowed on purpose, the fast is broken and the day must be made up.
Islam also teaches that forgetfulness and mistakes are forgiven. Allah teaches believers this dua:
The Prophet ﷺ also said that whoever eats or drinks forgetfully should complete the fast, because Allah fed and gave him drink (Sahih al-Bukhari 1933). Scholars treat a true accident differently from deliberate swallowing. If you are unsure about your own case, ask a trusted local imam. See What if I eat by mistake while fasting?
Is the rinse still necessary?
Yes. Rinsing the mouth and nose is a sunnah of wudu that all schools value, and the Hanafi and Hanbali schools consider it required for ghusl. Fasting does not cancel it. You simply do it more gently.
- Rinsing the mouth stays part of wudu while fasting.
- Do it gently, spit everything out and avoid gargling (Jami at-Tirmidhi 788).
- An accidental drop is forgiven by many scholars, but the Hanafi and Maliki schools advise making up the day.
- Swallowing water on purpose breaks the fast.
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Wudu lasts until something breaks it. There is no time limit, so you can pray several prayers with one wudu. Here is what ends it.
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