What is inside the starter kit? January 21, 2020 19:10 Updated Follow The starter kit is composed of a Willo device, 1 mouthpiece and 2 cartridges of Willo toothpaste. Related articles Do I still need to floss after using Willo? Is Willo a waterflosser? Where else can I buy Willo outside willo.com? Is is safe to swallow the toothpaste ? How much toothpaste do you inject? Is brushing equally effective for everyone? What is the Willo Fit Finder Kit?