What Happen if I Use Laser Hair Removal in Less Than Two Weeks Interval Session? Does It Have Any Bad Effect?

Laser Hair Removal is most often performed in our office at 6-8 weeks intervals, depending on the site.  With proper treatment parameters and with the appropriate laser, most all hairs should have been temporarily removed or damaged with each treatment, with the damaged hairs falling out over the 1-2 weeks after treatment.  It will normally take 4-8 weeks, or more, for the hairs that have not been permanently damaged to regrow to a significant enough length for re-treatment.  In general, with each treatment you should see long term or complete hair reduction of about 20-25% of the remaining hairs.

Hair treatment at very frequent intervals such as you describe, is of no benefit in the properly treated patient.

Recommended intervals between laser treatments are based on the time required to allow hairs to enter their active growing cycle. The laser is only effective when the hair follicle is in its active growth phase. Generally, about 15% of hairs are permanently removed with each laser treatment. Repeat sessions are necessary to treat additional hair follicles when they re-enter the growth phase.