PTF (Photo Therogy Flash) technology is the advanced and improved version of IPL ( Intensive Pulse Light_. It is based on the principle of selective phjoto-thermolysis, in which ligh is selectively absorved in the hair shaft and hair follicle, without damaging the surrounding skin tissues. Therefore they absorbed more light than the surrounding area,causing the temperature to rise along with the hear to the point of coagulation.
The coagulation damages the hair follicle and hair bulb, therefore prevents of delays regrowth.