And this is our fibers joint, also known as the fixed or immovable joint. And the same thing on the teeth. If we zoom in on this single upper tooth, that is connected to our upper jaw, also known as our maxilla. 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.