You should not dye your hair wet, but keep it dry for better results and minimal damage to the hair and scalp. If you dye your hair wet, it will not only affect the colour but also reduce the adhesion of the dye and it will fade more easily, so generally you should not dye your hair wet. If you are worried about getting your hair too dirty, you can wash your hair a day or two before dyeing and not on the same day.

1. Conclusion: Don't. From a professional hairdressing point of view, hair should not be dyed wet, because dry dyeing will have a better effect and last longer than wet, so most hairdressers do not wash their hair first when they dye it, and if you dye your own hair at home, you can't wash your hair before you dye it, so you must remember this basic common sense.

2. Why can't you dye your hair wet? There are two main reasons: the first is that with wet hair, there will be moisture on the hair and scalp, which will lead to the hair dye being diluted, then the colour will change and there will be uneven hair colour. The adhesion of the dye paste will be reduced and it will also be more likely to fade and keep the colour for a shorter time.

3. The second reason for not dyeing wet hair is that it is more damaging to the hair and scalp than when it is dry. We should know that the hair will secrete some oil, it can protect the hair and scalp, if you wash out these oils, it will let the hair dye directly contact with the hair and scalp, then the damage will be greater, and leave it although it also has damage but will be smaller.

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It is best not to wash your hair a few days before dyeing it

The hairdresser's advice is usually not to wash your hair for two or three days, but the actual situation can be adjusted flexibly by yourself, for example, if your hair is easily oily or particularly dirty, then it is fine to wash your hair the day before and not to wash it again afterwards. If you plan to colour your hair, it is best to prepare your hair well in advance rather than going in completely unprepared.