Abstract
Because some people seek consultations for the removal of unwanted body hair, a permanent, safe, and non-invasive method of hair removal is needed. Laser hair removal has been a popular cosmetic procedure. It is a monthly treatment that may take up to ten sessions for permanent results. However, its efficacy varies due to the patient’s biological skin hair traits, the adjustment of the optimal parameters of the laser, and the protocols. The purpose of this review is to discuss the properties and parameters employed for laser hair removal. Once parameters for laser hair removal have been optimized, this treatment offers an effective and permanent solution for unwanted body hair.
Highlights
Unwanted or excess hair is a prevalent condition affecting various aspects of life, including medical, social, and cultural
Laser hair removal may be employed in preparation for surgery [2], for hirsutism [3], and to treat scars [4], folliculitis, and hypertrichosis
Pulse duration: the time that the light takes to emit, measured in picoseconds, nanoseconds, microseconds, or milliseconds: o Thermal Relaxation Time (TRT): the time that the tissue needs to reduce the temperature generated by the emission of the laser light by 50%; the pulse duration must not be below the TRT; this way, less energy dissipation in the underlying structures and no undesirable effects, such as epidermic damage, happen [7]: TRT for the epidermis: 3–10 ms; TRT for the hair follicle: 40–100 ms; o Thermal Damage Time (TDT): the time required to heat the target chromophore;
Summary
Unwanted or excess hair is a prevalent condition affecting various aspects of life, including medical, social, and cultural. Properties and parameters for effective laser hair removal: A review. When laser light falls on the skin it may be reflected, transmitted, dispersed, or absorbed It only produces an effect on tissues if absorbed. Pulse duration: the time that the light takes to emit, measured in picoseconds, nanoseconds, microseconds, or milliseconds: o Thermal Relaxation Time (TRT): the time that the tissue needs to reduce the temperature generated by the emission of the laser light by 50%; the pulse duration must not be below the TRT; this way, less energy dissipation in the underlying structures and no undesirable effects, such as epidermic damage, happen [7]: TRT for the epidermis: 3–10 ms; TRT for the hair follicle: 40–100 ms; o Thermal Damage Time (TDT): the time required to heat the target chromophore;. The pre-treatment recommendations are the following [8]: 1. Remove make-up from the areas to be treated: Makeup prevents the laser from reaching the hair root, compromising the results
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