Periodontitis (also known as periodontal disease or pyorrhea) is a condition characterized by the gradual recession of the gums and exposure of the tooth roots.
If not stopped, this process will almost certainly lead to tooth loss.
Gingival recession is the loss of soft and hard tissues in the mucogingival region. Excessive gum recession and exposure of the root surface of one or more teeth cause increased root sensitivity to external stimuli.