Too much and too dense dyeing will do harm to the hair, which will turn yellow, split, lose luster and break. Experts suggest that it is best not to dye your hair more than twice a year.
Hair dyeing interval is at least 3 months. In order to avoid excessive stimulation and damage to scalp and hair follicles, the interval between dyeing hair must be more than 3 months. Frequent dyeing of hair is easy to destroy the quality of hair and make the dyeing effect worse and worse.
In addition, a sensitivity test should be done before dyeing hair. 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.
It is best not to wash your hair before dyeing 1 day. This can preserve the grease on the scalp and protect the scalp. Avoid shampooing and dyeing. In the process of dyeing hair, don't "wash your hair" in order to avoid a lot of hair dye getting on your scalp.
If you have an allergic reaction when dyeing your hair, you should seek medical advice immediately. Pay attention to the scalp condition at any time after dyeing hair. If allergic reactions such as itching and swelling occur, you should seek medical attention immediately. If you don't pay attention, it is easy to cause hair follicle necrosis.
Extended information coloring instructions:
Consumers should choose formal and legal channels to buy hair dye cosmetics and buy products with clear labels; Purchase vouchers and product packaging information should be kept.
Check the product name, manufacturer's name and address, net content, ingredient list, production date and shelf life (or production batch number and expiration date), production license number, cosmetic approval number/record number and other information.
When buying imported products, we should also check their Chinese product names and Chinese manufacturers to prevent the occurrence of adverse events caused by fake and shoddy products. Product information can be found on the website of China Food and Drug Administration.
Read the product manual carefully before use, and it is recommended to do a skin test: if the product is indicated in the manual for professional use, consumers are not recommended to use it by themselves.
According to the instructions, ensure the use interval and avoid adverse reactions/incidents caused by excessive and frequent use; The ratio of hair dye to oxidant should be strictly in accordance with the requirements of the instructions to ensure that all components can be effectively neutralized.
Hair-dyeing cosmetics should not be used in other parts except hair, and consumers under 16 should not use them, and hair dyeing and perm should not be carried out at the same time; If there are any adverse reactions/incidents of hair dyeing cosmetics in the past, avoid using the same product again.
Attention should be paid to products with the same brand name. If the color numbers are inconsistent, it means that the formula components are inconsistent and belong to different products. Even products with the same brand and color number may be different in different production batches.
Remind users to pay attention to the color number and production batch number when purchasing products; It is recommended to do a skin test before each use, especially when changing products or buying new products.
The general test site is the skin behind the ear, and a small amount of evenly mixed hair dye products are taken for testing. If the skin test method has been specified in the manual, please follow the instructions. When the self-test is difficult to determine, it is recommended to consult a professional medical institution.
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