The main reason for nail infection is that the toenail is cut too short, and when wearing shoes the skin at the distal end of the toenail is squeezed, wrapping the distal end of the toenail, which can irritate the skin in the process of growing, plus bacterial infection occurs. So the requirement to cut toenails generally stay longer, cut toenails are accustomed to cut into curved, both sides will be lower than the skin. The correct way to cut a toenail is to cut it flat, not curved, and both sides of the toenail should be higher than the skin, not lower than the skin, so that the toenail will not irritate the skin during the growth process. So cut your toenails flat and above the skin on both sides, and pay attention to these two main points.