My tongue is always dry and my mouth is watering. What happened?

Hello; Generally speaking, dry mouth is caused by yin deficiency and internal heat. When yin deficiency leads to insufficient body fluid and can't replenish water in time at night, dry mouth will appear. This situation can be adjusted by nourishing yin. It is suggested that chrysanthemum, Ophiopogon japonicus and Adenophora adenophora should be soaked in drinking water for conditioning. I wish you good health.