The beautician will make a sound when he knocks on the back of the guest. How is this done?

First, let's judge the hair quality. Hair quality is divided into (oily/neutral/dry undamaged/dry damaged). You can see the hair quality from half the length of the hair. Hair roots usually produce oil to protect scalp and dry hair, so hair roots are oily; Hair tip has the longest generation cycle, so it is the driest. Slide your finger from the hair root to the hair tip and observe its half length. By touching and feeling the hair, you can clearly know the real state of the hair. To judge whether the hair is damaged, you can hold the hair shaft with two fingers or palms and pull it gently. Healthy hair is like a spring, which has natural elasticity and will rebound slightly; But the hair is damaged and is likely to break. From the appearance, we can also see whether the hair is damaged. The damaged hair will lose its luster and turn light brown because the epidermis of the damaged hair floats out and lacks texture. If the hair is healthy and undamaged, the hair epidermis will become supple, the surface will be smooth and lovely. The incidence is divided into (resistant hard hair/normal healthy hair/slightly damaged hair/moderately damaged hair/severely damaged hair). Hard hair resistance: Hairstylists and hairdressers are characterized by less pores, strange hair elasticity, fast resilience, difficulty in absorbing water and easy drying, and belong to water-repellent hair. The water drops off surprisingly quickly when the hair is washed, which is its main situation. General healthy hair: characterized by smooth surface, black and lovely, good elasticity, belonging to normal hair. Its main situation is that it bounces back quickly, has good resilience, or has never been damaged by perming, and it is often maintained. Hair is delicate and soft: it is easy to absorb water and belongs to water-absorbing hair. Less hair, fashion hairstyle is not easy to fix. The main situation is that it is easy to generate static electricity, with acceptable elasticity and slow resilience. This kind of hair condition is most likely to cause blow-drying, perming and dyeing damage, so it should be handled strangely. Slightly damaged hair: characterized by the destruction of epidermal tissue from the beginning, it is easy to cause the phenomenon of scales everting, and dust and impurities in the air are easy to stay on the hair. The most important thing is that after washing your hair, your scalp feels itchy after only one day. At this time, it is possible to choose a shampoo that is not suitable for your hair. The main situation is that dust and impurities are detonated. This kind of hair condition often becomes difficult to comb and slightly dry. Moderately damaged hair: characterized by porosity, hair is easy to change color, dry and break, absorbs water quickly, has poor elasticity, has no resilience, and breaks when pulled slightly. The main situation is easy to generate static electricity and hair necrosis. It's best to cut it off and do a strange treatment on your hair. Seriously damaged hair: it is porous, dry, fast in water absorption, fast in static electricity generation, poor in elasticity, slow in resilience and easy to break. The most important thing is that it is easy to knot and difficult to comb. Cut off the damaged part of your hair and do the best hair care. Remember, when you clearly understand the guest's hair condition and quality, you will use it more accurately when cutting hair or using drugs.