The stem cells are responsible for the nutrition of the hair or the hair root. The SHR applicator is hovered over the skin, hair and underlying stem cells warm up slowly and continuously until each area has reached a temperature of approximately 45° Celsius. In order to be able to reach the stem cells effectively with the emitted light rays, an active connection to the hair root is also required here (anagen phase). Each hair acts like fiberglass as a “bridge” to the hair root and the connected stem cells. When the stem cells have reached the desired target temperature, the protein denatures. As a result, it can no longer supply the hair root or the follicle with nutrients and every single treated hair falls out.
Before the treatment
It is also important that no hair should be depilated before treatment. Because in that case the aforementioned “bridge” is missing to establish the contact of the light with the stem cells of the hair follicle. A treatment of each individual hair at this point is recommended after 4 weeks at the earliest, when the hair has regenerated and is in the anagen phase of growth.
Shaving in the corresponding area is still possible. The hair is only taken back to the skin surface, the “bridge” to the stem cells below the skin remains, so that a proper treatment can be carried out there. It is even advisable to shave the area to be treated the day before the appointment. The skin may relax after shaving, before the actual treatment is done. This leads to reduced redness and irritation of the skin.
Skin areas that are tattooed generally can not be treated. This is due to the colors used in the tattoo. It can not be ruled out that these react to the treatment with both the IPL and the SHR method and that color changes occur. This represents a health risk, which must be avoided at all. All tattoos are therefore omitted in a treatment.
The same applies to the body’s own pigments (for example birthmarks (nevus)). These contain the mentioned dye melanin and therefore absorb the wavelengths of light more than the rest of the skin. To prevent possible biological reactions of these, they are covered and not treated.