I use Crest Whitestrips Advanced Seal, and the top and bottom strip are too short and does not cover all of my teeth. Can I use 2 rather 1 to make it cover every teeth? Is it safe? Does it still whiten that way?
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They are not supposed to cover ALL of your teeth, only the teeth you see when you smile. This typically means to your premolars only. But yes, if the whitestrips aren't covering all the teeth you see when you smile, you can use 2. Perhaps try using 2 "bottom" strips on the top... and a "top" strip for the bottom.
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