Are Grinds Coffee Pouches Healthy? Both coffee and tobacco grinds can stain teeth with yellowed hues that compromise overall oral health. The primary causes are tannins and nicotine present, which penetrate enamel over time and stain it yellow in hue. To minimize staining it’s essential to limit how long grinds remain in the mouth as well as maintaining an effective oral hygiene routine; SNOW offers various effective products designed to remove and prevent staining due to tannins or nicotine that penetrate enamel – check out their Magic Teeth Whitening Strips, Foam and Toothpaste products to keep your smile bright and beautiful – all to help achieve that beautiful and radiant smile!