This invention provides methods and systems for saliva management provided with an oral apparatus. One of the present systems includes an oral interface, a fluid flow-direction regulator and a fluid communication tube. The oral interface is placed inside a user’s oral cavity and the fluid flow-direction regulator is connected between the oral interface and the fluid communication tube. The fluid communication tube is connected to a negative pressure source to constitute a negative pressure path between the oral interface and the negative pressure source. The saliva inside the user’s oral cavity is collected to a liquid collector through the negative pressure path. The fluid flow-direction regulator directs all the fluids flowing through to the fluid communication tube to effectively clear the saliva inside the fluid communication tube while maintaining the negative pressure environment inside the oral cavity.本發明提供一種口部介面裝置之唾液處理系統及其方法,其包括一口部介面裝置、一流體調向器及一連通管。該口部介面裝置放置於一使用者口腔內,該流體調向器連通於該口部介面裝置與該連通管之。該連通管連通於一負壓源,以在該口部介面裝置與該負壓源之間構成一負壓途徑,該使用者口腔內的唾液通過該負壓途徑而收集於一儲液槽。該流體調向器用以限制所有流體是流向該連通管,進而在保持使用者口腔內部負壓環境的情況下持續地或視需要地通入空氣於系統管路中,以利於清除該口部介面裝置與前述管路中的唾液。1‧‧‧口部介面裝置之唾液處理系統11‧‧‧三向連接件12‧‧‧連通管13‧‧‧單向閥14‧‧‧儲液槽15‧‧‧負壓源17‧‧‧計時器18‧‧‧控制單元19‧‧‧警示裝置100‧‧‧口部介面裝置110‧‧‧可撓性氣流導管120‧‧‧第一開口端部130‧‧‧第二開口端部150‧‧‧可撓性屏障
