I had my teeth whitened here twice. Two thirty minute sessions. I can see hardly see any difference, neither can my boyfriend of any of my friends. The girl who did them was a bit pushy about how they were much whiter so I didn't ask to have them done again. I didn't have much sensitivity in my teeth but it made my gums raw and bleed a little at the base of my front teeth for about two days after my first treatment. Though Perla is cheaper than most teeth whitening, if you end up with the same results as I did you will probably end up paying another $500 for professional teeth whitening soon after. The girls who work there all have very white teeth, with the results I had I struggle to believe that th