How do they remove a cast from foot?

Use Rotary tool: Should never be done by yourself.Always have it done by medically trained personnel we use a hand held rotary tool with a small wheel to lightly cut the surface of the cast.The goal is to remove cast without touching the cotton material underneath, we remove 1/8th inch pieces of the casting material in a straight linefrom top to bottom.Make similar cut on either side of 1st cut. Make sure no injury.