How is permanent hair removal defined?

The term permanent hair removal is defined by the FDA (Food and Drug Administration USA) as a significant reduction of hair for a period longer than the hair cycle in the region. The oldest method by which permanent hair removal can be achieved is needle epilation. For some years now, however, laser and IPL epilation have been used for permanent hair removal with increasing success. The SHR method with 3 wavelengths is the state of the art in laser technology for permanent hair removal.