Objective:To investigate the role of tea polyphenol in oral microecology in patients with fetid breath and the clinical effect of tea polyphenol in the treatment of fetid breath based on an analysis of bacterial community structure in samples.Methods:Saliva was collected from 6 patients with fetid breath and was mixed up thoroughly,and then 4 samples with a volume of 5 m L each were prepared.The 4 samples were mixed with the TPY medium in positive group,experimental group,negative group,and blank group,respectively,and were cultured for 48 hours.Genome sequencing was performed for the V3 and V...