Do I really need to floss? January 22, 2020 17:53 Follow Yes, you do! Brushing removes food debris and plaque that are on your teeth, but not BETWEEN your teeth. Related articles Will gum disease affect the rest of my body? Willo and vulnerable populations I saw a little bit of blood on my mouthpiece after I brushed with Willo, is this normal? How often should I replace my mouthpiece? How often do I need to use Willo?