I have been the victim of many serrated can lids. I liked to eat a lot of tuna fish when I was a child, and many times I had to use a regular can opener. My appetite for tuna was so great that I was not a patient child, thus cutting my hand on many of those serrated lids after using a can opener. I was happy to learn that, although many years later, someone invented a smooth can opener. I don't eat nearly as much tuna but I've opened a lot of cans with a smooth can opener. Although they cost a lot more ($12-$40 depending on what type), using a smooth can opener is well worth the price NOT paid in blood. This article will show you how to use a smooth edge can opener
How to Use A Smooth Edge Can Opener
Place the top edge of the can within the gap of the circular moving parts of the smooth edge can opener. Be sure the turning handle is on the outside of the can. The smooth edge can opener should almost feel "locked" onto the can lid. Some other manual types, like the Kitchen Aid smooth edge can opener, lock with the can opener handle on the top of the can.
While holding the can in place with one hand, use your other hand to turn the smooth edge can opener knob clockwise. Keep turning until you complete the circle.
Remove the smooth edge can opener from the top of the can. You should be able to simply lift the lid off the top.