Brite smile, lasted about 6 mo, home bleaching trays with 32% peroxide 2-4 hours per day for 4-6 wks lasted the longest. avoid coffee/teas/blueberries, chocolate otherwise, they return to normal color. avoid acid foods, lemons I like to eat them supposedly it wears away enamal. just eat healthy, good fruits/veg/milk/water, avoid junk foods with artificial dyes, cheetos etc.