Frequently Asked Questions When should I replace the Philips Care Infusion Covers? If the performance of the Care Infusion Cover, such as conditioning and fragrance, are no longer optimal, replace the covers to enjoy maximum care for your hair. Up to 1 month or 10 straightening sessions Depending on your hair length and frequency of use, the covers can be used for up to one month (when used twice a week on shoulder-length hair) or for about 10 straightening sessions. Use the covers within 3 months after opening the packaging The decoration on the covers acts as an 'empty' indicator to show you when the covers should be replaced. The fragrance will also guide you Do not use the covers when damaged. Note: If the decoration on the covers fades after only a few uses, you might be pressing too hard during styling. The covers are sensitive to pressure.