友: 喉頭發出嗯嗯~(手揮兩下) <---嘴裡都是器械，是要怎樣說話?
牙醫: 還好嗎? 那妳都怎麼喝?
友: ???? (用嘴喝啊! 不然是怎樣，鼻胃管嗎?)
牙醫: 喔~那以後就跟著meal 喝~不要整天喝~ (這醫生看來是會讀心術)
好啦~沒那麼誇張啦! 不相信隨便網路傳言是真的! 不過這個topic，還真的是背後有有兩個博士跟一個發表過的學術論文~ (驕傲的咧~)
Along those lines, eating just about anything has also been shown to have the same effect - so does one stop eating?
FYI, Green tea has actually been investigated as a form of therapy for halitosis and has some beneficial effects in that area - see attached.
The mild antibacterial activity of components of black and green teas would actually beneficial in the oral context.
However, tea drinking can and does lead to staining on tooth surfaces.
Hope this helps.
In thinking about this question over lunch, there may be a misunderstanding at the heart of the student's question to you.
Drinking tea is unlikely to have anything other than a beneficial effect on dental plaque.
However, drinking lots of tea, lots of coffee, or lots of red wine - all of these either alone or in combination - IS associated with producing increased STAINING of teeth.
Perhaps the dentist was really talking about increased staining as a result of tea drinking.
While unsightly, staining is not of itself harmful. People do pay dentists to remove such staining from their teeth. A lot of the market for tooth whitening products also addresses this area.
Just to complete the picture: In the pre-fluoride days, some degree of brown staining in the mouths of children was actually suggested as indicating caries resistance. Then along came the first commercial fluoridated toothpastes - they contained stannous fluoride - and they were associated with some staining.