Have you ever been brushing your teeth or eating a certain food and suddenly thought of a dental question, only to forget it by the time your next checkup rolled around? Don’t despair! We've got the answers to a few common oral care questions we hear at our dental practice.  Why does spinach make my teeth feel gritty?Believe it or not, the reason your teeth feel dirty or gritty after eating spinach is because of its high calcium content. That’s right, the very thing that helps make spinach so good for us can often drive would-be fans away. When those elevated levels of calcium combine with another ingredient in spinach, oxalic acid, the two form crystals that cause both the slight bitterness in the leaves and that weird (but totally harmless) gritty feeling on your teeth.