It’s much deeper than that, but it is a good start – kinda. Anicca Dukkha and Anatta are the focal point, applying it to hair makes no sense because you can still have your hair the way you want it/like (at least to the extent it is possible), but have no problem with it. If you try to apply it to everything, you will get tired easily. It applies to everything, as long as you can understand it you do not need to go one by one.
One thing may lead to all things too – there are certain examples in suttas when bhikku could not understand Dhamma so Buddha used example so he can grasp the nature of Anicca, Dukkha and Anatta and this is important to understand to focus on nature of it, not hair.
