It depends on the type- there are some that allow you to make trays that fit your teeth and then you put a gel into them which lighten your teeth. They are usually a little more expensive but more thorough. Alternatively there are the ones that are just strips you wear on your teeth for like 30 minutes. They do the trick within like 7 days. Also there is a kinda wand-like painting option but I have never heard great results from them. Either way you go your teeth will feel a little more sensitive so be careful!
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