Hi Sylvie, I heard back from my contact at L'Oreal, who checked with the haircolour experts at their technical centre as well as consulting stylist Eric Del Monaco...

AND.... the answer is that you're best off calling the L'Oreal Consumer Care Centre for a personalized recommendation. They need to know more details about your hair type/condition/colour etc before they can recommend how to do this.

The number is 1.888.4.LOREAL and the experts will give you a proper diagnostic (e.g. confirm if your ends are colour treated, etc.) and then give a recommendation.

Sorry I couldn't get a more detailed answer for you but I think you'll get excellent guidance here! Good luck!