How many applications are included in each Root Reboot kit? November 07, 2019 22:42 Updated Each Root Reboot kit contains one application with enough product to fully saturate your T-zone (hairline and roots). Related articles How long will Root Reboot last? If I have remaining Root Reboot after I apply, can I save it for a second application? How soon after using Root Reboot can I apply permanent color? Can Root Reboot be colored over with permanent color? When should I use Prime for Perfection? Comments 0 comments Article is closed for comments.