The knife closing depth is appropriate. Lace scissors are used to cut the edges of sticky notes into wavy and other shapes. According to relevant information, the principle of keeping lace scissors from falling off is that the depth of the knife is appropriate and the line angle is between 310 degrees and 315 degrees. Use dental scissors. To cut the edge of the fabric with teeth, it is best to use the smallest tooth scissors. The serrated edges can effectively prevent the edges from coming off the line.