Proper coffee can play a certain role in losing weight, because it can inhibit stomach absorption to some extent, but the energy of coffee is not low, which is eventually converted into ATP and then into fat accumulation, so it is recommended that you do not use coffee to lose weight.
Drinking coffee for a long time, as long as you brush your teeth carefully every day, will not lead to tooth discoloration. But in clinic, I often meet many patients who drink many cups of coffee a day, but don't pay attention to brushing their teeth, which leads to the exogenous coloring of their teeth, that is, the teeth turn yellow or brown, but this can still be removed by cleaning their teeth.