I did Bright Smile about 6 years ago. They used gel & the light. I didn't see as much of a difference as I would have liked. They told me at my consultation that my results wouldn't be that great b/c my teeth were on the whiter side of the scale already. Oh & just a warning, my teeth HURT that evening but I have sensitive teeth. I got tons of compliments afterwards though, everyone noticed & said they looked great. I'm thinking about getting it done again but would need something for the pain this time ( I am usually not a whimp, BTW).