The Cavity Zapper

We used a real toothbrush and a Legoâ toy motor for our prototype.
We attached the brush with tape to the toy. We put papier maché all
over everything even the batteries. Then we painted it.
When we turn the Cavity Zapper on, red lights flash and it makes a
motor sound. There are three different buttons for three different
We wanted the Cavity Zapper screen to light up
to show the bad bacteria so we used a night
light. We put it in a box and cut out a space for
the part showing the bacteria. We drew the
bacteria on paper with markers. When it's
plugged into a socket, light shows through the
bacteria part.
The toothpaste and floss we made with papier maché and paint.