White like veneers!

Does anyone have recommendations on getting whiter teeth? I am using a bleaching gel provided by my orthodontist because I am under Invisalign treatment. I don’t think it’s making much of a difference. I want that brighter smile. Do the UV lights make a difference when combined with the gel? And how often should someone bleach their teeth? I also use whitening toothpaste. I heard good things about Crest whitening toothpaste. I will try this next.