Salt Water vs Mouth Wash

Hi, this is my first reddit post.

My dentist advice me to use Salt Water to gargle instead of mouth wash.
Her opinion is Salt Water keep good bacteria in mouth, and good bacteria keep checking bad bacteria.
While Mouth wash kills all bacteria either it is good or bad bacteria in mouth.

I like her job, she is always using Xray before making decision. So, she can find hidden cavities.

However, I would like to know whether it is true that Salt Water is better than Mouth Wash.
Any opinion whether it is true that salt water is better because it keeps good bacteria in mouth?

submitted by /u/evantan90
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from https://www.reddit.com/r/Dentistry/comments/gmlrl5/salt_water_vs_mouth_wash/