Tea　is　the　most　widely　consumed　beverages　next　to　water,　however　little　is　known　about　the　influence　of　sustained　tea　consumption　on　the　oral　bacteria　of　healthy　adults.　In　this　study,　three　oral　healthy　adults　were　recruited　and　instructed　to　consume　1.0　L　of　oolong　tea　infusions　(total　polyphenol　content,　2.83　g/L)　daily,　for　eight　weeks.　Salivary　microbiota　pre-,　peri-,　and　post-treatment　were　fully　compared　by　high-throughput　16S　rRNA　sequencing　and　multivariate　statistical　analysis.　It　was　revealed　that　oolong　tea　consumption　reduced　salivary　bacterial　diversity　and　the　population　of　some　oral　disease　related　bacteria,　such　as　Streptococcus　sp.,　Prevotella　nanceiensis,　Fusobacterium　periodonticum,　Alloprevotella　rava,　and　Prevotella　elaninogenica.　Moreover,　via　correlation　network　and　Venn　diagram　analyses,　seven　bacterial　taxa,　including　Streptococcus　sp.　(OTU_1),　Ruminococcaceae　sp.　(OTU_33),　Haemophilus　sp.　(OTU_696),　Veillonella　spp.　(OTU_133　and　OTU_23),　Actinomyces　odontolyticus　(OTU_42),　and　Gemella　haemolysans　(OTU_6),　were　significantly　altered　after　oolong　tea　consumption,　and　presented　robust　strong　connections　(|r|　＞　0.9　and　p　＜　0.05)　with　other　oral　microbiota.　These　results　suggest　sustained　oolong　tea　consumption　would　modulate　salivary　microbiota　and　generate　potential　oral　pathogen　preventative　benefits.　Additionally,　diverse　responses　to　oolong　tea　consumption　among　subjects　were　also　noticed.