No, a comb does not shed all its hair. Combs are made from a variety of materials, such as plastic, wood, or metal, and each type of comb has its own unique properties that make it more or less likely to shed its hair. Plastic combs, for instance, tend to be more prone to shedding than metal combs due to their softer, more pliable nature. Wood combs are generally the least likely to shed, as the material is stronger and less prone to breakage. To prevent your comb from shedding, it's important to take care of it properly, such as storing it in a dry place, using it only on healthy hair, and cleaning it regularly.