Use of flat scissors and serrated scissors for hairdressing

A haircut is to cut your hair straight and flat. Sawtooth scissors are used to cut broken hair or fine hair, which is also broken hair. They must be used for different purposes. If there is only one purpose of measuring scissors, it is to cut hair. If he divides it, it is that the two uses must be different. The effect of cutting out is also different. It's for the convenience of haircut, not haircut.