To understand periodontal disease, it is important to have an idea of the anatomy of the tooth and its supporting structure (called the periodontium).
A tooth is made of two main parts:
The root anchors the tooth in the jawbone.
A small fold between the gum and the tooth is always present. This fold, is also called pocket.
A small measuring tool, called periodontal probe, allows the dentist or periodontist to measure the depth of the pocket.
The pockets are usually shallow when the gums are healthy.