This is the innovation that applied anthropometry to design that is the toothbrush. The toothbrush is innovation that the power of observing the behavior of your users and integrating it into a design process. The toothbrushes have two formats together. The toothbrushes handle for adults Is large and long.
The toothbrushes handle for the kid is smaller and shorter. However, kid's toothbrushes have fat, squishy handles for that he could more catch easily. finally, design the curved shape of the toothbrush handle. It will be easier to catch.