Under normal circumstances, hair can only grow about 0.3 mm a day, 1 mm in three days and 0.9~ 1.2 cm a month, that is, it can grow10.8 cm ~14.1cm a year, which is not very fast.
From a purely theoretical point of view, according to the speed at which hair can grow from 10.8 cm to 14. 1 cm in a year, a normal healthy person can grow to about 7.58m to10.08m from birth to his death at the age of 70.
Precautions for hair care:
1, use appropriate shampoo. Everyone's hair is different, including dry hair and oily hair. Everyone should find a shampoo suitable for their hair, keep the acid-base balance and water-oil balance of their hair, and also choose a mild shampoo to be a refreshing and clean little fairy!
2. Pay attention to nursing methods. You can comb your hair before washing your hair, and then squeeze out the shampoo. Rub it with your hands before applying it to your hair, because if you apply it directly to your scalp, too much shampoo will lead to hair loss.
The shampoo should be kept at room temperature, neither too high nor too low. Before using the conditioner, use a towel to absorb excess water from your hair. When applying conditioner, don't apply it directly to the ends of your hair. You can comb your hair for 5- 15 minutes and then wash it with warm water.
3. Use less hair dryers. When the water content of hair is reduced to below 15%, the hair will become rough, dull and split. This will happen if you often blow dry with a hair dryer. The best way is to let your hair dry naturally. After washing your hair, you can't rub it hard with a towel, which will damage the surface of your hair and make it split and dry. Gently press the hair to absorb excess water.
4, a reasonable diet, pay attention to drink more water in the diet, eat more fresh green vegetables processed with slow fire, with low-fat protein meat dishes, such as river fish, chicken, etc.