Each laser varies in effectiveness and number of treatments needed. The laser we use at Smooth Reflections suggests 6-10 sessions per body area. This may vary from person to person depending on circumstances such as the hormonal influence for hair growth or thickness/density of hair. A female with PCOS may need more sessions to reach the desired outcome or may require some maintenance treatments. A man's back might require additional sessions as this area tends to have a stronger hormonal influence as well. Again, it is not a definite these specific scenarios would require more treatment, but they could.