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My teeth look yellow, and I don't think it looks good aesthetically. I'm worried. I've always thought about teeth whitening, but I'm curious about the procedures and the duration of the treatment. If I get my teeth whitened, can I still drink things like coffee? Also, I want to know how long the whitening lasts, how many times I need to do it, and the different methods available. If it's a method that involves removing some enamel, I wonder if it causes sensitivity. I'm worried because I can't tolerate pain well. I want to learn more about teeth whitening.