The lasersmile teeth whitening system utilizes the lasersmile diode laser. Diode lasers emit light at a wavelength of 798 to 815nm which is part of the near infrared region of the electromagnetic spectrum. The emissions of this specific wavelength "photo activate" the whitener and increase the efficiency of the whitening process. The lasersmile laser whitening system provides targeted, specific, gentle and completely safe results. Laser Teeth whitening is fast and you'll get on average 9 shades lighter teeth in just one visit that last about 45minutes and of that only 24minutes constitute actual laser use. The results will last for about 5 years.