Page 73 - Chapter 3 - An Introduction to Laser/IPL Hair Removal

Chapter 3 – Fundamentals of Laser/IPL Hair Removal 1st Edition
Bikini 43% 37% 17% 3%
33% 30% 24% 6% 4% 3%
84% 16%
Chin 66% 28% 4% 2%
48% 31% 13% 5% 2% 1%
Table 18 – As the EKR (effectvie killing rate) drops, the number of sessions required to completely kill all the follicles increases, in all body areas.
The table above shows us quite clearly that photothermal hair removal is a case of ‘diminishing returns’ (see Table 18). Each time the patient/client comes back for a follow-up session, they have fewer follicles available for treatment. Even fewer of those will be in the anagen phase at the time of treatment.
Take, for example, the treatment of a chin with an EKR of 60% (which appears to be fairly average). According to our results in Table 18, up to around 48% of all the follicles may be destroyed in the first session. But, only 31% might be destroyed in the second session. This then reduces to 13, 5, 2 and then finally 1% in each subsequent session. But this assumes that the correct parameters are being applied in each treatment session!
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60
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Figure 28 – The progression of hair removal during treatments.
Figure 28 shows how laser/IPL hair removal progresses. At ‘Day 0’, the area is full of hairs in all three phases – anagen, catagen and telogen. During the first treatment, some (typically between
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