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I had my teeth whitened at the dentist yesterday, and I'm so happy that my teeth have gotten two shades brighter. I'm planning on getting them whitened again, but I've heard both at the dentist and online that even if you get them whitened at the dentist, your teeth will eventually return to their original color. So, I'm anxious, even though it hasn't been that long since I got them whitened. Please tell me how long the effects last, and how I should maintain them to prevent them from reverting to their original color!