Here's why:
* Hair dye only affects the hair shaft: Hair dye doesn't change the pigment cells (melanocytes) in your scalp that produce your natural hair color.
* Hair grows from the root: New hair grows from the follicles at the scalp. As the hair grows, the dyed portion gradually moves further away from the scalp, revealing the new, undyed hair underneath.
* The rate of growth varies: How quickly your natural color returns depends on your individual hair growth rate, which can vary between people.
Important note: Hair dye can sometimes cause changes to the hair shaft that make it more difficult for your natural pigment to return. In these cases, you might need to wait longer or use other hair care techniques to help restore your natural color.