Does dark roasted coffee stain your teeth more?


I am doing a science fair experiment comparing how different types of coffee affect staining your teeth.

Does dark roast coffee have more caffeine? Does dark roast coffee stain your teeth more?


It's true, coffee can stain your teeth. As do tea, colas, wine and certain fruits.

As for the mechanism that causes the stain to penetrate into the enamel, I don't know the answer to that for certain.

But it is reasonable to assume that the acidity of the coffee might have something to do with its ability to penetrate into the enamel on your teeth.

If this is the case, you are better off drinking a dark-roasted coffee, as dark-roasted beans contain less acid than light or medium-roasted beans.

Does dark roast coffee contain more caffeine? No, it doesn't. In fact, the darker the roast, the less the caffeine. The heat involved in the roasting process actually reduces the amount of caffeine in the roasted bean.

I hope this helps!

Comments for Does dark roasted coffee stain your teeth more?

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May 05, 2010
wow this really helped

this really helped i am doing a science fair but with gatorade milk and soda and i didn't know that fruits could or would stain your teeth well I new strawberries would but not any other well maybe I guess because i don't know all the fruits in the world!!! <3

Nov 14, 2009
teeth stains
by: Anonymous

why did the coffe stain more than the coke

Aug 20, 2009
dark coffee
by: Anonymous

So, if this is true, does darker coffee have less compound available to "stain" the teeth - since most are burned off?

According to, it looks liek darker coffee has less acitity as well

May 01, 2009
Science fair project
by: Zay 2k9

I'm doing a science project on teeth and my results are gatorade decays and detierates teeth more than coffee, high sugar juice, soda, and water. do you know where i can get pic's of teeth that are damaged because of those drinks that I menchened plz and thnk u.

Apr 18, 2009
caffeine science fair project
by: Anonymous

I'm also doing a science fair project of caffeine I am going to use caffeine free sodas dark sodas coffee and decaf coffee what do you think the results will be?????!!!!!

Jan 10, 2009
Liquid stains on teeth
by: Anonymous

We are also doing a science fair experiment, using several different liquids (Coffee, tea, grape juice, Coca Cola, apple juice, orange juice). Our results show that grape juice stains the worst followed by coffee, Coca Cola, tea, apple juice then orange juice.

Nov 30, 2008
Science Project
by: Anonymous

Why do you think coffee stains teeth more so than Coke? I am doing a science fair project and my results showed that coffee stained porcelain darker than the Coke did!

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