When one brushes his teeth with toothpaste there remain a white substance on the tongue for a while. Is it ok to swallow this substance when it is mixed with saliva during fasting or should we make it disappear staight away (which is difficult) ? October 10, 2021 by Hasan mahdi It should be cleaned, otherwise, it spoils the fast, except if it was very tiny and got dissolved in the saliva. Sheikh Mohammad Habeeb englishFasting