Which stage of periodontitis is characterized by 1-2 mm clinical attachment loss (CAL)?

Stage I Periodontitis is characterized by a clinical attachment loss (CAL) of 1-2 mm, which represents the initial stage of periodontitis. At this stage, inflammation is present, and it typically involves the loss of some periodontal support but is still relatively mild when compared to the more advanced stages of periodontitis.

In Stage I, the changes are often limited to the gingival tissue and the supporting structures of the teeth have minimal damage. Patients may not always experience significant symptoms, making it essential for regular dental evaluations to catch such conditions early.

As periodontal disease progresses to Stage II, the attachment loss increases to 3-4 mm, indicating a greater degree of periodontal tissue involvement. Stages III and IV are characterized by even more severe attachment loss and additional complications, including tooth mobility and tooth loss, which are not present in Stage I.