Answered by Ustadha Shazia Ahmad
Does licking the lips more than once invalidate the fast?
Answer:
If one licks the lips once, and then immediately licks them again, this does invalidate one’s fast.
It says in the Reliance of the Traveller, i1.18:
“Each of the following things invalidates the day’s fast when one knows they are unlawful (A: during an obligatory fast) and remembers one is fasting (A: but does them deliberately anyway); and they obligate one to both make up the fast-day later and fast the remainder of that day:
11) swallowing saliva that has left the mouth, such as when threading a needle and one moistens the end of the thread, and then remoistens it, swallowing some of the saliva, that the thread had been previously wetted with;”
And Allah knows best.
Shazia Ahmad
