i went three times a week for about 9 weeks. it worked. well almost. it would have worked if i could have finished my treatments. i have insurance but my copay is $30 US at every appointment. I had to stop. I couldn't afford to keep going. it worked though. when i stopped i had all my back healed except in one tiny spot that didn't bother me. i still get some breakouts but i think if i would have continued the laser treatments i would have been healed totally.