You can use mouthwash while fasting, but only with serious caution, and many scholars actually recommend avoiding it during fasting hours to be safe.

Quick Scoop

  • Using mouthwash while fasting is generally said to be technically allowed if:
    • You do not swallow anything at all.
    • You spit it out completely and rinse your mouth thoroughly.
  • If even a small amount goes down your throat, most scholars say your fast is broken.
  • Because it is so risky and very hard to control, many imams and teachers strongly advise avoiding mouthwash during fasting hours and using it before Suhoor and after Iftar instead.
  • Alcohol‑free mouthwash is usually preferred when it is used, due to dryness and other concerns.

If you’re asking about religious / Ramadan fasting , always follow your own madhhab and ask a local scholar you trust for a ruling tailored to you.

Religious fasting (Ramadan and similar)

What most scholars say

From various fatwa sources and scholar explanations:

  • Rinsing the mouth itself does not break the fast, because the fast is only broken when something passes down the throat.
  • So, using toothpaste or mouthwash is described as permissible but dangerous , because:
    • The taste, foam, and liquid are hard to control.
    • You are “one millimetre away” from breaking your fast if anything goes under the throat.
  • Some fatwa committees explicitly allow medicinal mouthwash if you:
    • Spit it out thoroughly.
    • Make sure nothing intentionally reaches the throat.

Because of that, many teachers and scholars recommend:

  • Avoid mouthwash in fasting hours if you can.
  • Use it:
    • Before Suhoor (pre‑dawn).
    • After Iftar (after Maghrib).

Intermittent / health fasting

If you mean intermittent fasting for health, the question is a bit different:

  • Plain or alcohol‑free mouthwash, used only as a rinse and spat out, typically doesn’t provide calories and most health‑fasting guides consider it okay and not a “break” of the fast.
  • However:
    • Some strict “clean fast” protocols ask you to avoid flavored or sweetened products during the fasting window, even if you don’t swallow, to avoid triggering insulin or appetite.
* If you are following a specific program or app, check _their_ rules, because definitions of “breaking a fast” can differ.

Best practices to stay safe

If you do use mouthwash while fasting (religious)

  • Use a small amount and keep your head slightly down so nothing runs back.
  • Swish briefly, then spit several times.
  • Rinse your mouth with plain water afterwards and spit again.
  • Avoid doing this often; reserve it for necessity and ideally outside fasting hours.

Safer alternatives during Ramadan

Many scholars and dentists suggest:

  • Use miswak/siwak , which the Prophet is reported to have used while fasting.
  • Brush teeth gently with a dry or very lightly moistened toothbrush, taking care to spit everything out.
  • Focus on:
    • Good tongue cleaning.
    • Flossing at night.
    • Avoiding strong‑smelling foods at Suhoor.

Different viewpoints at a glance

Here’s a compact view of how people look at the question “can you use mouthwash when fasting”:

[8][9][1][3][6] [9][1][6][8] [1][3][6][9] [3][6][1] [10][4] [4]
View Summary Condition
Permissible with caution Allowed to use mouthwash if nothing is swallowed.Rinse and spit completely; if any liquid reaches the throat, fast is broken.
Best to avoid Technically allowed but too risky, so advised to avoid during fasting hours.Use instead before Suhoor and after Iftar.
Health / intermittent fasting Generally considered okay as it’s not swallowed and has negligible calories.Some strict “clean‑fast” plans still prefer avoiding flavored/sweet rinses.

Mini story: A typical Ramadan scenario

Imagine Ali, fasting in Ramadan, feeling self‑conscious in the office by midday. He wonders if a quick swish of strong mint mouthwash will help. His imam has explained that while rinsing with mouthwash does not automatically break the fast, Ali would be taking a real risk: a small swallow by mistake would nullify the day’s fast. So instead, he uses miswak during the day, then after Maghrib he brushes thoroughly and uses mouthwash before Taraweeh, staying both fresh and confident that his fast is safe.

Bottom line

  • For religious fasting (like Ramadan):
    • Most say: allowed with extreme care , but safer to avoid during fasting hours and use before Suhoor and after Iftar instead.
* If any amount is swallowed, the fast is considered broken.
  • For health / intermittent fasting :
    • Usually fine, since you don’t swallow and it doesn’t meaningfully add calories, but check the rules of the fasting method you follow.

If this is about your religious practice, the most reliable step is to ask a trusted local scholar or imam and follow their specific guidance for your school of thought.

Information gathered from public forums or data available on the internet and portrayed here.