So basically, the maxilla is connected to our tooth via this joint, known as our fixed joint, shown in blue. So basically, when the human is born, they begin to develop and the density of fibers inside this joint basically increases tremendously. It becomes very dense. And the fibers in the joint are the collagen fibers and that's exactly what makes this joint so strong. Now, the second type of joint is a synovial joint. And these are the joints that basically create a very wide range of movement.