Prof.Wang Yuying believes that senile xerostomia is manifested as oral dryness,but substantially results from the dysfunction of zangfu organs,yin,yang,qi and blood.In terms of pathogenesis,deficiency and excess syndromes are classified.The deficiency syndrome results from the metabolic dysfunction,with liver,kidney,spleen and stomach involved.The excess syndrome results from the obstruction of water passage with pathological products,with phlegm and stasis involved.All of those lead to abnormal distributio...