TLDR Photoepilation significantly reduces hair, and phototrichograms can objectively measure its effectiveness.
The study aimed to objectively evaluate the efficacy of photoepilation using a phototrichogram method. Thirteen young, healthy, female volunteers underwent intense pulsed light-assisted photoepilation on their axillae twice at 4-week intervals. Hair variables were assessed using phototrichograms and digital cameras. Eight weeks after the treatments, all patients showed significant hair reduction, with decreases in total hair counts, anagen ratio, non-vellus hair counts, hair density, anagen growth rate, and hair diameter. Doctor evaluations correlated with anagen hair counts, anagen/total hair ratio, anagen/telogen ratio, and total growth rate. The study concluded that phototrichograms could serve as an objective technique for evaluating hair removal, with anagen parameters and total growth rate being predictive values for assessing epilation efficacy.
Cited in this study
3 / 3 results
82 citations
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May 2005 in “Dermatologic therapy” Laser hair removal has advanced to effectively reduce hair for various skin types and hair colors.
57 citations
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June 1999 in “Dermatologic surgery” Laser hair removal was a significant new method for getting rid of unwanted hair in 1999.
112 citations
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July 1998 in “Journal of Investigative Dermatology” Ruby laser pulses best destroy hair follicles during the growth phase and effectiveness varies with laser intensity; melanin is key for targeting, and timing treatments can improve results.
1 citations
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March 2019 in “Journal of Biomedical Science and Engineering” 
June 2018 Baldness is often hereditary and linked to male hormones, becoming noticeable when half the hair is lost.
14 citations
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June 2016 in “Experimental Dermatology” Hair regrowth doesn't convert thin hairs to thick hairs, but increases overall hair density.
November 2012 The woman has unexplained hair loss and it's unclear what her condition is or how to treat it.
14 citations
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May 2011 in “Facial Plastic Surgery Clinics of North America” Laser hair removal is effective for dark hair but needs improvement for nonpigmented or fine hairs.
January 2001 in “Nishi Nihon hifuka” The document concluded that there are differences in hair growth cycles and skin cell turnover rates, which can be measured with electronic equipment.
4 citations
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April 1999 in “Dermatologic Clinics” Long-pulsed ruby lasers effectively reduce hair for up to 2 years with minimal pain.
