Any dark-colour objects (in this case, dark skin & hair shafts of all growth cycle including anagen) absorb light from laser and turn the light into heat and give off such heat to surroundings that have no dark pigments, such as colourless follicles containing hair stem cells. Any colourless, red, blond, grey & white objects don't absorb light produced by the current LHR devices.
Only hairs in anagen phase are still in contact with the parts of colourless hair follicles containing colourless stem cells. Even though hairs in other growth phases absorb light from laser and give off heat to surrounding but they have lost contact with stem cells. If the stem cells aren't destructed, hairs will eventually grow back.
Please wait around 6-8 weeks (not earlier and not later) after waxing, plucking, threading, using epilation cream or other methods that affect or disturb hair underneath the skin, before starting/resuming your LHR session.
To ensure, ultimate uttermost reduction result from light therapy for hair removal, it is recommended to WAX around 6-8 weeks prior to light therapy, expecting ALL hair that emerging out of your skin post waxing are in anagen.
When should you cease having LHR?
You must experience ALL of the following events every single time you are having LHR done:
1. Your hair follicles become inflamed (red angry bumps) 10-15 mins after they are hit by laser beams.
2. Your hair fall out/shed within 1-2 weeks after the treatment.
If you do NOT experience these 2 events, stop wasting your money and cease laser, diode or IPL hair removal.
Electrolysis becomes your only choice that can permanently destroy every hair.
Other topics:
-- How to get the most permanent reduction from LHR
-- Nearly everything clients need to know about IPL or LHR