How do you prove periodontal attachment loss?

Periodontal attachment loss is proven through a clinical examination that measures probing depth and clinical attachment level (CAL). This involves using a periodontal probe to assess the depth of the sulcus or pocket around each tooth. The CAL is calculated by measuring the distance from the cemento-enamel junction to the bottom of the pocket, and a loss is indicated when this measurement exceeds normal levels. Radiographic evaluations may also complement this assessment by showing bone loss associated with periodontal disease.