Page 75 - Chapter 3 - An Introduction to Laser/IPL Hair Removal

Chapter 3 – Fundamentals of Laser/IPL Hair Removal 1st Edition
Table 19 suggests a surprising increase in the number of required sessions for a relatively small drop in EKR between 60% and 40% - more than double. Figure 29 shows number of required sessions for a number of body areas, assuming 8 week intervals between sessions.
Figure 29 - The number of treatments required to kill all follicles for a number of body areas, assuming an 8 week interval in each case. This clearly shows that adopting such an approach results in many more
repeat sessions than may be necessary.
However, our model clearly shows that the first treatment will always generate the highest clearance – around 36% (in the upper lip). Subsequent treatments kill fewer follicles, simply because there are less to treat each time.
Figure 30 - Each treatment can kill a certain percentage of follicles, but fewer follicles are killed each time. The difference between 4 and 8 week intervals can be seen. Leaving an 8 week gap between treatments results in more clearance of the follicles.
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