I’ve used whitening trays before. How are Crest Whitening Strips different?

Crest Whitening Strips are far more cost-effective than whitening trays, in addition to being more comfortable and allowing you to whiten your teeth on to go. Whitening your teeth with teeth whitening strips is much less hassle, and cuts out the guess work because every strip contains the optimum amount of whitening gel required to brighten that smile.