Wednesday, June 24, 2009

Tea, Coffee and Cocoa: All Good for Your Teeth

The caffeine in coffee is good for teeth.
The caffeine in coffee is good for dental health. (Photo by Ballistik Coffee Boy)

It may not come as a big surprise to you that green tea is good for dental health. After all, green tea is the miracle cure for pretty much anything, right?

If you're not a huge fan of green tea, worry not: there are other beverages out there that can do the same. In fact, if you're a long time follower of this blog, then you already know that not only green tea but also black tea helps prevent dental caries. Both are also good for the gums.

The good news doesn't stop there, however. A recent review found that in addition to tea, cocoa and coffee showed anti-cariogenic potential as well (link). The reason behind this effect is the polyphenol content in all three. Though each three has different polyphenols that work in different ways, they all appear to get the job done and improve oral health.

Cocoa and dental caries

According to the authors of the review, studies have shown that additing cocoa powder or chocolate to hamster diets reduces their caries incidence. Unsurprisingly, cocoa powder or dark chocolate works better than chocolate with high sugar and low cocoa levels. Water-soluble extracts of cocoa powder also inhibited caries formation in rats.

The two main strains of bacteria that cause caries are Streptococcus sanguinis and Streptococcus mutans. Although the case is not entirely clear, cocoa polyphenols seem to inhibit the growth of the former but not the latter.

Cocoa also reduces plaque formation by inhibiting the enzyme dextransucrase, which forms plaque extracellular polysaccharides from sucrose. In one study, a mouth-rinse made from the ground husk of cocoa beans was effective in reducing plaque scores in children.

Coffee and dental caries

Roasted coffee beans were shown in two studies to be antibacterial against S. mutans. Coffee also appears to interfere with the adsorption of S. mutans to teeth. In another study, coffee did not inhibit the growth of the bacteria, but did reduce the adherence of bacterial cells to dental surface. In other words, while coffee might not kill the bacteria, drinking coffee could prevent it from sticking to your teeth.

The compounds in coffee that are most active in terms of dental health are trigonelline, caffeine and chlorogenic acid. It is possible that the anti-adhesive effect is due to the synergistic action of these (and other) chemicals in coffee.

Tea and dental caries

Since I've already covered the topic of tea and dental health in an earlier post, I'll just go over the review findings briefly here.

Tea polyphenols appear to protect from dental caries primarily through their anti-microbial action. While cocoa and coffee are mostly effective against the adhesion of bacteria on the surface of teeth, tea in addition actually inhibits the growth of several strains of Streptococcus. The polyphenols in tea also reduce the formation of plaque, the production of acidic compounds and the synthesis of glucan from sucrose. Importantly, commercial teas have been shown to inhibit salivary amylase activity, which may significantly reduce caries formation from foods with starch.

Green tea, black tea and oolong tea (which is somewhere between the two in terms of fermentation time) have all been shown to be beneficial for oral health. Even though white tea has not been studied, it very likely has much of the same benefits as green tea. Due to its light color, it may also stain teeth less than green or black tea.


Tea, coffee and cocoa are all beneficial for dental health. Tea appears to be the best choice, since the polyphenols in tea are not only able to inhibit the adherence of bacteria to teeth, but also prevent the growth of cariogenic bacteria.

Tea is also effective against S. sanguinis and S. mutans, the two main strains responsible for caries, while coffee and cocoa seem to only work against the latter. While the effects of coffee have only been tested in vitro, cocoa has been shown to prevent caries formation in animals and reduce plaque in humans.

For more information on oral health, see these posts:

The Role of Coenzyme Q10 in Oral Health
Whitening Teeth & Healing Gums – Experiment Update
Dental Health Effects of Green and Black Tea
Preventing Mouth Ulcers with Tea Tree Oil Toothpaste - Results after Two Months

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6 kommenttia:

Christina Crowe August 5, 2009 at 12:48 AM  

Interesting news! I had no idea that coffee was good for teeth, let alone tea and cocoa. This goes to show that you learn something new every day. :)

troglodytemignon October 27, 2009 at 2:39 AM  

Really love your blog....

My question is: could it be that stained teeth or teeth color is unrelated to teeth health??

If coffee/tea stains teeth but helps teeth health, is it possible teeth color is simply an aesthetic choice?

teeth whitening December 5, 2009 at 6:51 AM  

I do take green tea and the way you have told really it's a cure for many health problems...It's nice to know some important matters from your post.

Human829 January 31, 2012 at 8:13 PM  

Drink or rinse mouth with tea/coffee? Wouldn't the acid erode your enamel?

Jen February 18, 2012 at 2:48 AM  

According to Ramiel Nagel, whose work is based on the research of Dr. Weston Price, it's not bacteria that are responsible for tooth decay. It's the lack of fat-soluble elements in the diet.

That said, I agree with a previous poster that xylitol is very helpful.
I think this may be less about its antibacterial action and due more to its alkaline qualities and that it favors the assimilation of calcium and stimulates the flow of saliva.

Great blog btw!

Anonymous December 3, 2012 at 5:05 AM  

Tooth decay is actually caused by acid. Whether it is acidic food, regurgitated stomach acid, or the acid produced by bacterial fermentation of food particles. However, the former two are usually balanced out by the saliva, which is inherently basic, and neutralizes these acids. But a bacterial infection of the mouth continually produces high amounts of acid, which saliva alone can't neutralize. Good oral hygiene removes the food bacteria need to thrive, but good methods such as these which combat the ability for bacteria to adhere, and in the case of xylitol, having antibacterial qualities, is just icing on the sugar-free cake. :)

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