Post shaving problems like razor burns and bumps are common. An alum block is a natural as well as a harmless way to combat those problems. It not only cools the area but also refreshes it. It is also effective in killing surface bacteria. This works in stopping the bleeding by constricting the blood vessel and, in a way, tightening pores. Hence, it is the most important shaving supplies that you need to have. It will help you deal with razor burns and bumps.