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!