Speaking mouth always have saliva, under normal circumstances, speaking salivary glands will secrete saliva to lubricate the tissues, disease conditions, if there is periodontitis, caries, oral ulcers, etc., will stimulate the salivary glands to secrete saliva, as follows. 1. Under normal circumstances: saliva has the role of moisturizing, protecting the oral mucosa, etc., saliva secretion increases when talking to ensure that pronunciation is clear, while avoiding damage to the tissues of the oral cavity due to friction. 2. In case of disease: periodontitis, caries, oral ulcers and other diseases exist in the mouth, the salivary glands may secrete more saliva under the stimulation of inflammatory factors, pain and other factors. Speaking always have saliva in the mouth may have other reasons, it is recommended to go to the hospital in a timely manner, clear causes for targeted treatment.