Number One Son, the inventor, conceived and constructed this idea. You recognize the tooth brush, the back of which is precision drilled to interference fit the black rubber tube. Secured to the brush handle and plugged into the other end is a standard squirt tube with tooth paste. It’s all neatly packaged in multiple wraps of duct tape. One just squeezes a little to force out the paste. It’s easy and as the name implies — Inna Rush Brush!