This article needs additional citations for verification. Laser hair removal is the process of hair hair cream removal by means of exposure to pulses of laser light that destroy the hair follicle. It had been performed experimentally for about twenty years before becoming commercially available in the mid-1990s. Rox Anderson discovered that it was possible to selectively target a specific chromophore with a laser to partially damage basal stem cells inside the hair follicles.
This method proved to be successful, and was first applied in 1996. In 1997 the United States Food and Drug Administration approved this tactic of hair removal. Melanin is considered the primary chromophore for all hair removal lasers currently on the market. Melanin occurs naturally in the skin and gives skin and hair their color. There are two types of melanin in hair. Eumelanin gives hair brown or black color, while pheomelanin gives hair blonde or red color.
Laser hair removal has become popular because of its speed and efficacy, although some of the efficacy is dependent upon the skill and experience of the laser operator, and the choice and availability of different laser technologies used for the procedure. Some will need touch-up treatments, especially on large areas, after the initial set of 3-8 treatments. The review found no statistical difference in short term effectiveness, but a higher incidence of side effects with diode laser based treatment. Hair reduction after 6 months was reported as 68.
IPL, though technically not containing a laser, are sometimes incorrectly referred to as «laser hair removal». IPL-based methods, sometimes called «phototricholysis», or «photoepilation», use xenon flash lamps that emit full spectrum light. Electrolysis is another hair removal method that has been used for over 135 years. A study conducted in 2000 at the ASVAK Laser Center in Ankara, Turkey comparing alexandrite laser and electrolysis for hair removal on 12 patients concluded that laser hair removal was 60 times faster, less painful and more reliable than electrolysis. Shaving is a technique in which one removes hair from the skin with a razor. A razor is needed to shave and is a way of removing hair for a short period of time. Shaving has been popular as a temporary hair removal technique since at least the 1700s.
In 1895 King Gillette invented a razor that was sharp, thin, disposable, and cheap enough to make. This razor was a big hit and has now been modified to look like how they are today. Shaving, however, is not as permanent as laser hair removal and can lead to irritation of the shaved area. Waxing is another option for hair removal. This method is an efficient way of removing hair for a semi-permanent period of time. The ancient Egyptians developed a similar mechanism, sugaring, in which one would mix oil and honey then apply it to the skin. As waxing has evolved, there are two types of waxing.
In one, the strips are already ready to use, and one can apply it to the skin and peel it off in the direction opposite to the hair growth. Another one involves heating up the wax, applying it to the skin, and then placing a cloth on it and pulling away from the hair growth. In some countries, including the U. Several wavelengths of laser energy have been used for hair removal, from visible light to near-infrared radiation. Hair-removal laser working at 755 and 1064 nm. The device to the right provides air cooling.
The length of the heating pulse relates directly to the damage achieved in the follicle. When attempting to destroy hair follicles the main target is the germ cells which live on the surface of the hair shaft. Light energy is absorbed by the melanin within the hair and heat is generated. The heat then conducts out towards the germ cells. Spot size, or the width of the laser beam, directly affects the depth of penetration of the light energy due to scattering effects in the dermal layer.
Larger beam diameters or those devices that has a linear scanning results in deeper deposition of energy and hence can induce higher temperatures in deeper follicles. Fluence or energy density is another important consideration. It’s important to get treated at high enough settings to heat up the follicles enough to disable them from producing hair. Epidermal cooling has been determined to allow higher fluences and reduce pain and side effects, especially in darker skin. Contact cooling: through a window cooled by circulating water or other internal coolant. This type of cooling is by far the most efficient method of keeping the epidermis protected since it provides a constant heat sink at the skin surface.
Sapphire windows are much more conductive than quartz. Multiple treatments depending on the type of hair and skin color have been shown to provide long-term reduction of hair. Most patients need a minimum of seven treatments. Current parameters differ from device to device but manufacturers and clinicians generally recommend waiting from three to eight weeks between sessions, depending on the area being treated. Laser does not work well on light-colored hair, red hair, grey hair, white hair, as well as fine hair of any color, such as vellus. For darker skinned patients with black hair, the long-pulsed Nd:YAG laser with a cooling tip can be safe and effective when used by an experienced practitioner. Typically the shedding of the treated hairs takes about two to three weeks.