When you wake up in the morning with a lot of saliva in your mouth, there may be physiological factors, such as normal reaction, etc.; there are also pathological factors, such as gingivitis, dental calculus and other factors. 1. Physiological factors: when sleeping at night, inappropriate sleeping position may lead to salivary gland pressure, so may appear in the morning to get up with a lot of saliva in the mouth. 2. Pathological factors (1) such as gingivitis, due to bacterial infection or improper brushing, teeth are stimulated by inflammation, etc., will lead to salivary gland secretion, saliva increase, so may appear in the morning to get up in the mouth more saliva. (2) such as dental calculus, due to the failure to develop the habit of brushing teeth on time, pay attention to oral hygiene, etc., there may be dental calculus, the presence of dental calculus will stimulate the secretion of salivary glands, resulting in an increase in saliva, and therefore there may be a situation in which you wake up with a lot of saliva in the mouth in the morning. When you wake up in the morning with a lot of saliva in your mouth, if you have any uncomfortable symptoms, you should consult a doctor in time to find out the reason, so as not to delay the condition.