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My tongue is covered with white tissue. I heard that the color of the tongue shows the state of the stomach. I used to smoke so I blamed that on smoking, but now I don't smoke and it just seems that I'm full of toxins. I'm in my fourth month. I'm just worriend. I asked my doctor and he agreed that it looked bad so he said he'll take some tissue for test if that don't go away. Is that common or do you have any explanations on that?