Can brushing teeth invalidate the fast? Is the fast broken by brushing teeth? Will brushing teeth affect the validity of the fast? Does brushing one’s teeth break the fast?

As gargling mouth with water without swallowing does not invalidate fasting, brushing teeth does not invalidate it either (al-Fatawa al-Hindiyyah, I, 220). However if toothpaste or water reaches one’s stomach, fasting is invalidated. Considering the possibility of invalidating the fast, it is appropriate to brush the teeth before imsak and after iftar, and not to use paste if brushing while fasting.

Source: Presidency Of Religious Affairs The Turkey, High Board of Religious Affairs FATWAS

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