It is not bad to swallow saliva during Ramadan.
Swallowing saliva is a natural bodily function, and it is not considered to break the fast. The fast is broken by consuming food or drink, and saliva is not considered to be either of these.
The Prophet Muhammad (PBUH) said: "When one of you fasts, let him not spit, nor blow his nose, nor make a noise." This hadith indicates that it is permissible to swallow saliva during the fast.
It is important to note that the fast is broken by intentionally consuming food or drink. If saliva accidentally enters the stomach, it is not considered to break the fast.
Therefore, you can swallow your saliva during Ramadan without worry.
