Maybe one day in the future, robots will live inside our bodies. They can clean your arteries and help your lungs filter out pathogens to keep you healthy. So how do they keep your body clean? It's by using tiny brushes. Although we don't know how many years it will take for this to become a reality, there are now such robotic toothbrushes. Half of it is a robot, and half is a toothbrush. But we don't know if this robotic toothbrush can be used to brush teeth. However, it can be played as a small toy. Place it on the table, and it can swing and move around. If you put two robotic toothbrushes together, they might even fight each other. This robotic toothbrush is currently priced at $10 overseas.