The child can paint the hair from the age of ten, but the painting must be done in a hairdressing salon and with the use of own paint for the child, without ammonia and without hydrogen peroxide, such as Wellaton toning shampoos or of Biotom, for example.
These products do not harm the scalp and are less harmful to the wires. But you need to be careful to moisturize your hair weekly, as they will be easier to get dry and brittle.
The later the girl leaves to put any type of chemistry on the hair, later this will need treatments to soften, shine and lower the volume. At this stage the child may also stop using children's capillary products and may use adult products, which contain specific ingredients for damaged hair.