As long as you follow the hair dye's instructions and you're not allergic to the dye, coloring your hair shouldn't damage your scalp. That being said, you're applying chemicals to your skin, so it's important to take the proper precautions. Before you color your hair, conduct a patch test to ensure you won't have an allergic reaction to the dye.
Simply place a dab of the hair dye behind your ear or just inside the crook of your arm and leave it there for two days. If you don't notice any skin irritation when you rinse off the dye, you're not allergic to it and can safely color your hair.
There has never been a better selection of home coloring kits for your hair and unless you have extremely sensitive skin, they are unlikely to cause any damage to your scalp. There are also now ammonia free types available, which are even more gentle, so if you are in any doubt, you could opt for one of these. As stated in the previous answer, check out your reaction if any, to the product, by doing a test patch.
I have been coloring my hair for many years after starting to go grey in my twenties! I always keep to a good quality brand and I have never had any problems. The one exception, which can cause big problems in terms of hair damage and scalp irritation when used by an unskilled person is hair bleach.
This is very strong in chemicals and is best left to professionals to use.
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