Your gum tissue should fit snugly around your teeth like a turtleneck around your neck. In a healthy condition, the depth of the sulcus between your tooth and gum tissue should be no more than 3 mm. When you have periodontal disease, this supporting tissue and bone is destroyed, forming “pockets” between your teeth and the surrounding gum tissue.
Over time, these pockets may become deeper, providing a larger space for bacteria to live. As bacteria develop around the teeth, they can accumulate and advance under the gum tissue. These deep pockets collect even more bacteria, resulting in further bone and tissue loss. Eventually, if too much bone is lost, the teeth will need to be extracted.