More saliva is mainly due to the following reasons: 1, currently there are symptoms of spleen and stomach weakness, which will lead to gastric reflux at night and easily cause increased salivation. 2, usually like to eat sweets, resulting in the mouth in a hypertonic state, also easy to drool. 3, congenital salivary glands developed, resulting in increased salivation. 4, abnormal secretion of saliva due to neuroregulatory disorders. Regardless of which causes the increase in saliva, we must do a good job of adequate oral hygiene, brush your teeth regularly, especially before bedtime must be brushed, followed by timely rinsing of the mouth after meals. Reduce sweet food, acidic food, food residues and other corrosion caused by the oral cavity, and develop good sleep habits to reduce the bad stimulation of the oral cavity and salivary glands.