Often a person has used the same hair color formula for several years without any problems, and then it begins to not look the same. Hair color not covering anymore?
As our bodies change so does our hair and one's base color changes dramatically sometimes. Especially with gray, you have to use a hair color that is recommended for coverage on gray hair.
*L'Oreal's color for gray coverage is Excellence and Clairol's is Gray Buster. If in doubt, always consult a hair stylist.