Hair growth happens in a regular cycle that involves three phases: active, regression and resting. Laser technology is designed to treat hair in the active stage of growth. The number of treatments required for long-term results depends upon your hair growth cycle, the body area being treated and the density of hair. Additional factors affecting hair growth include age, skin type, diet, hormones, medication and metabolism. On average it takes 6 treatments spaced between 4 to 6 weeks apart to attain permanent results.