Yes, there is nothing wrong with a fasting person swallowing his saliva, but some scholars said
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The questioner : You fast three days every month, and when swallowing saliva, you say it increases beyond its normal limit. Is it permissible to swallow saliva while fasting?
The Shaykh : Yes, there is nothing wrong with a fasting person swallowing his saliva. However, some scholars said that it is disliked to gather saliva and then swallow it. As for without gathering it, saliva does not harm, whether it is little or much. Even if he gathers it and swallows it, there is no blame on him, for it does not break the fast, because he has not eaten or drunk, and what is forbidden is eating and drinking. Yes.
The Shaykh : Yes, there is nothing wrong with a fasting person swallowing his saliva. However, some scholars said that it is disliked to gather saliva and then swallow it. As for without gathering it, saliva does not harm, whether it is little or much. Even if he gathers it and swallows it, there is no blame on him, for it does not break the fast, because he has not eaten or drunk, and what is forbidden is eating and drinking. Yes.