The growth of hair is a certain periodic, which is mainly related to the growth cycle of the hair follicles. The growth cycle of hair follicles is divided into growing phase, regression phase and resting phase. In the growing phase, hair matrix cells develop rapidly and differentiate into hair shaft, causing the hair to lengthen. During the regression phase, the hair bulb is degraded through apoptosis.
Laser pigmentation removal is based on the blasting effect of laser and the principle of selective absorption by pigmented tissues. High-energy pulses act on pigmented tissues (such as pigment and tattoo inks), which absorb the light and rapidly expand, breaking down into fine pigment particles. This effectively removes the pigmentation.
Laser skin rejuvenation, also known as IPL photorejuvenation or pulsed light skin rejuvenation, is a technology that uses high-energy pulsed light for cosmetic skin treatments. It effectively addresses various skin concerns such as texture improvement, pigmentation and enlarged pores. This technology works by having water molecules in the skin absorb the laser energy, causing a rapid increasing temperature in the treated area, which will damage the epidermis and a part of the dermis.
Diode laser devices leverage selective photothermal interaction where laser energy is absorbed by hemoglobin or water molecules to rapidly generate thermal energy. This energy vaporizes pathological tissue for precise cutting, while simultaneously sealing blood vessels and lymphatic vessels to achieve hemostasis (stoppage of bleeding).
Laser technology, owing to its key advantages of precise control, minimal invasiveness with low pain, and rapid postoperative recovery, has been extensively integrated into the full spectrum of dental treatments. From fundamental care such as caries treatment and periodontal management to advanced procedures including cosmetic dentistry and implant restoration, it is gradually supplanting certain traditional instruments (e.g., dental drills and scalpels), emerging as a crucial diagnostic and therapeutic tool in modern dentistry.
The laser targets the painful area on the surface, and penetrates into the deep issue, and is absorbed by the tissue at the specific wavelength, thereby stimulating physiological responses in the body, promoting blood circulation, enhancing metabolism, increasing the activity of red blood cells, accelerating ATP generation, and improving vitality (improving circulation, reducing inflammation, relieving pain, and promoting wound healing).