Cosmetic, non-therapeutic use of (a) sodium chloride in agents for oxidatively dyeing and/or oxidatively lightening keratinic fibers reduces the damage to the keratinic fibers resulting from use of the agents. Also, a ready-to-use agent for oxidatively dyeing and/or oxidatively lightening keratinic fibers includes (a) sodium chloride, (b) potassium chloride, (c) optionally at least one further salt from the group magnesium carbonate, magnesium hydrogen carbonate, magnesium sulfate, magnesium hydrogen sulfate, magnesium chloride, calcium carbonate, calcium hydrogen carbonate, calcium hydrogen sulfate, calcium sulfate, and/or calcium chloride, and (d) hydrogen peroxide.
