Sometimes, bad breath isn’t so easy to eliminate. When bad breath becomes chronic and persists despite your best efforts at oral hygiene, it might be trying to tell you something more significant about your health.
Your Microbiome got disrupted and pathogenic bacteria have taken over and have built a biofilm, which is very difficult to get rid of. The biofilm is something like a nest for bad bacteria where they can create a hostile environment with low pH creating cavity. Toxins of the bad bacteria can cause an immune reaction in the gum and create a permanent silent inflammation.
Check out this article:
https://www.arcadiaperio.com/blog/is-your-chronic-bad-breath-trying-to-tell-you-something