Page 110 - Blog Posts v1

The success rate of a light-based treatment depends on the fluence, but so does the danger element...
Time between repeat sessions
So, we know that we can successfully destroy some follicles permanently if we apply the correct laser/IPL fluence and pulsewidths. But, how long do we wait until the next treatment session?
This is a little tricky...
The hair growth cycles are continuous. That means that the follicles across the body are in anagen, catagen and telogen phases all the time. But we cannot tell which ones are in which phase, without a detailed analysis of every hair!!
So, we must proceed on the basis that we can only successfully damage a portion of any hairy region at any one time. The data in table 1 was gathered from studies on people in the 60s and 70s. This data tells us what proportion of hairs are in anagen or telogen phase, their durations and the depths of the hairs across various parts of the body.
Let’s look at ‘armpit’ hair...
From table 1 we see that around 30% of armpit hair is in anagen, at any given time. So, we can only destroy 30% of these hairs in any one treatment. But this means that, in theory, we could destroy another 30% in the 2nd treatment, another 30% in the 3rd treatment, and the final 10% in the 4th treatment.
In theory, we could destroy ALL armpit hair follicles in four sessions!!
Mike’s Blog Posts 110