What is the least damaging way to permanently color hair?

The least damaging way to permanently color hair is by using a semi-permanent or demi-permanent hair dye, which contains lower levels of ammonia and peroxide compared to traditional permanent dyes. These formulas deposit color without lifting the natural pigment, minimizing damage to the hair cuticle. Additionally, opting for plant-based dyes, such as henna or indigo, can provide a more natural alternative with fewer harmful chemicals. Regular conditioning treatments and proper aftercare can further reduce damage and maintain hair health.