2. Before bleaching and dyeing your hair, do an allergy test. Apply a small amount of hair dye behind the ear or inside the elbow and stick it with breathable tape for 24 ~ 48 hours. If the skin is red, swollen and burning during the test, you are allergic to this hair dye and should avoid using it. If there is no response, it means safety.
3. It is best not to wash your hair before bleaching and dyeing 1 day. This can preserve the grease on the scalp and protect the scalp.
Extended data:
Ways to care for hair:
1, often massage the scalp.
Apply a little olive oil to your hands and fingers, and then push it from the hairline to the back of your hair, with 50 massages each time, twice a day. This can effectively improve the problem of short dry hair, but also has the effect of moisturizing hair, which can quickly smooth short hair.
Step 2 Supplement protein
Hair will be fluffy and short-tempered when it lacks protein. The loss of protein will make the hair lack nutrition, so eat more meat, eggs and soybeans to supplement protein, so that the hair will no longer be dry, short-tempered and dull.
Step 3 avoid exposure to the sun
Hair should also pay attention to sun protection. In fact, ultraviolet rays are more than twice as harmful to hair as to face. Ultraviolet rays will make hair scales thin and fall off, and strong sunlight will make hair lose moisture and become dry and rough. Long-term ultraviolet radiation will split and break hair.
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