It is important to know that a comb knife is not an actual knife. It is referred to as a knife because it looks like one. It can come in multiple styles and may have the handles normally associated with knives. But then, it is not a knife. It has a comb instead of a blade. There are no sharp tips, sharp edges, or parts that can injure someone. Therefore, the comb knife is legal everywhere in the world. It can be taken outside and used everywhere. Many beauty salon employees rely on comb knives for their versatility.