The hair removal knife is the cheapest and easiest hair removal tool for people with sensitive skin type and fear of pain. When using it, you need to be careful to avoid scratching the skin and use lubricant before hair removal to protect the skin. Children and pregnant women should not use, its side effects are as follows: 1, easy to scratch the skin: before using hair removal knife hair removal, apply lubricant on the skin, so as not to damage the skin due to dryness; 2, hair on the faster regeneration: because the scraping off only the surface layer of hair, the root of the hair is still growing on the skin, keeping time short. And easy to cause newborn hair harder, need to develop the habit of shaving every day, otherwise for people with thicker hair can leave stubble; 3, bacterial infection: the use of hair scrapers must pay attention to hygiene, if not cleaned after using the hair removal knife, generally can be residual bacteria, easy to bring infection to the hair removal area in the next use, such as triggering folliculitis; 4, easy to cause dry skin: frequent users, can cause skin Dry, it is recommended to apply hair removal milk or moisturizing lotion before hair removal on the parts that need hair removal, which can protect the skin from the damage of the blade.