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This Youtube video claims that green tea "is the best mouthwash", citing various medical studies that claim that green tea is more effective in reducing dental bacteria than various standard chemicals. Quick googling has found me this study of University of British Columbia researchers, which (at least to me as a complete medical noob) seems to support this claim.

Is the advice to wash one's mouth with green tea medically plausible?

Sidenote: I found this earlier question, but it seems only loosely related.

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Answer: Yes, it probably does.

I found this referenced answer on authoritynutrition.com.

The catechins in green tea have other biological effects as well.

Some studies show that they can kill bacteria and inhibit viruses like the influenza virus, potentially lowering your risk of infections (31, 32, 33, 34).

Streptococcus mutans is the primary harmful bacteria in the mouth. It causes plaque formation and is a leading contributor to cavities and tooth decay.

Studies show that the catechins in green tea can inhibit the growth of streptococcus mutans. Green tea consumption is associated with improved dental health and a lower risk of caries (35, 36, 37, 38, 39, 40).

Another awesome benefit of green tea… multiple studies show that it can reduce bad breath (41, 42.

Bottom Line: The catechins in green tea may inhibit the growth of bacteria and some viruses. This can lower the risk of infections and lead to improvements in dental health, a lower risk of caries and reduced bad breath.

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    I think you are a bit too categorical. Note the many "mays" and "cans" in the summary. Also, I read through the abstracts of the cited studies; most of them are in vitro, with two animal studies and one non-blind human study. Perhaps the answer should be "It probably does" :) – P_S Aug 22 '14 at 17:51
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Sure! According to the study, the effect of green tea on teeth is very important because antioxidant catechin in Thai Nguyen tea has the effect of destroying micro-organism, virus in the palate.

Google Translate of a Tea Store's web-page

  1. Effect of green tea on teeth: preventing tooth decay

Green tea contains compounds, especially catechins, which control inflammation and fight bacterial infections. When using Thai Nguyen green tea products. The ingredients in tea work to control bacteria and reduce the acidity of saliva and dental plaque, which can be a useful tool in preventing tooth decay.

A study by Egyptian scientists concluded that people using green tea had very little bacteria and acid in their mouths. Not only that, green tea also ends the bleeding gums, root bleeding in those who are tested.

Along with that, the anti-inflammatory ability of green tea seems to help control the condition of the gums and gums. A survey of Japanese scientists on nearly 1,000 men found that people who drink green tea regularly benefit, healthy teeth and teeth than those who do not drink.

A German study found similar positive results in those who were asked to chew candy containing green tea extracts. Green tea also keeps teeth strong, does not lose teeth early, teeth are beautiful because of drinking Xinjiang Thai Nguyen tea.

  1. Effect of green tea with teeth: Anti-cancer of the throat and cancer

Excellent substances of green tea, especially epigallocatechin gallate (EGCG), protect cells from metastases and inhibit the growth of cancer cells. Specifically, in a study at the University of Texas, patients with pre-cancerous lesions in the mouth were tested using green tea extract. The results showed that the substances of Thai Nguyen green tea slowed the progression leading to oral cancer.

Besides, the effect of green tea with teeth is also expressed through breathing. Green tea gives you a cool breath, creating an impression that appeals to the audience in the conversation. The ingredients in Thai Nguyen delicious tea have the effect of destroying the bacteria that make our breath stink, stink, prevent the growth of bacteria that cause bad breath and produce bad compounds.

Research by the University of British Columbia, conducted to measure the level of bad smelling compounds in people's mouths after suffering from green tea powder or another substance believed to help with bad breath. And even, green tea gives you a smoother breath of chewing mint and chewing gum.

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Some of the information contained in this post requires additional references. Please edit to add citations to reliable sources that support the assertions made here. Unsourced material may be disputed or deleted.

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    Welcome to Skeptics.SE! Can you cite any of the studies or research mentioned in your answer? It looks like you blindly copy-pasted this from the link you provided, without actually checking to see if any of it was correct. That's not to say that your answer isn't correct, it's just not how we do things around here. (Take the tour and visit the help center for more information.) – F1Krazy Jul 19 at 12:19
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    Welcome to Skeptics! Please be very careful with marking other people's text with the quote formatting, so there is no chance of confusion with your words. – Oddthinking♦ Jul 19 at 17:48
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    Your source here is not reliable. It is marketing, and there is no way for us to follow up the references and find out if those studies were good quality studies, whether they found the results published here or even if they really existed. – Oddthinking♦ Jul 19 at 17:51

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