What is the cause of dry mouth and bad breath?

Dry mouth, bad breath, bitter mouth, generally caused by gastrointestinal heat accumulation. Dry mouth, usually with internal heat performance, often see dry mouth like drinking. Bad breath, generally caused by gastrointestinal stagnation. Due to careless eating, or poor spleen and stomach transport, resulting in stagnation of internal stagnation, rotten turbid qi reverse, forming bad breath. Bitter mouth is more common in liver and stomach stagnation heat, because internal heat affects liver and gallbladder, resulting in bile heat disturbance, forming bitter mouth. Dry mouth, bad breath and bitter mouth are all present, usually caused by gastrointestinal heat accumulation, often accompanied by stomach discomfort, flatulence, or pain, yellow tongue coating, etc., treatment needs to clear heat and stomach.