The influence in the hair growth cycle

1, Hair growth is divided into three periods, namely, growth period, retrograde period, and resting period.

Issued energy by laser instrument can only destroy the growing hair follicles, no significant effect to retrograde and resting period.

When only the hair runs into the growth period, laser can play a role.

So laser hair removal might needs multiple treatment, the effect can obviously.

2, When hair growth is a bit short of in the proportion, it is better to increase the number of treatment. 

Otherwise the number of treatment can be reduced.

3, Based on different parts of the hair have different growth period, the treatment interval will also be different every time. 

article source:
http://laserhairremovalnycglobe.blogspot.com/2012/09/the-influence-in-hair-growth-cycle.html