how long it stay white? is there any side effect??
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I have used them for years and am always happy with the results. How long it last will depend on the ones you buy. I use the original Crest Strips, cheaper ones, because the gel isn't as stronger. I have found with the 2nd and 3rd ones I experience a lot of teeth sensitivity and pain. The benefit of these are you only have to do them once a year. I have to use the original one twice a year, usually after a cleaning from the dentist. I also use Crest Vivid White tooth paste for both day and night. This helps even out the color when you are using the strips and give them a boost when you are in between whiting. I also recommend an electric tooth brush, this helps naturally whiten you teeth and keep them this way. Hope I have helped!
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