Discussion: Bad breath in the morning is present in almost every one. But when it comes to perpetual lousy breath, the condition may indicate an unbalanced intestinal flora.

The mouth is the beginning of the digestive system, and it serves as the mirror of the whole digestive system, in fact, of the entire body. (Using the tongue) Toxins and unwanted digestive products most often cause a bad smell. An imbalance in the intestinal flora is manifested in a proliferation of pathogens that secrete potent toxins. The body tries to eliminate these toxins in every way possible, including through saliva.

Link: The holistic principle and balancing gut flora are essential.
https://www.sf-healing.com/page/110 (Copy & Paste)