Quick! Call the Patent Office

During my (very strange) dream last night I was using a tube of toothpaste that had a toothbrush built on the end of it. Squeeze the toothbrush to add toothpaste then brush away. When the toothpaste runs out, it's time for a new brush. This is surely the holy grail of toothbrush design? Maybe someone has invented this already...

If not, my subconscious is a genius. This could make my fortune.