Which instrument is primarily used to check for periodontal attachment loss?

The probe is the primary instrument used to check for periodontal attachment loss because it is specifically designed to measure the depth of the periodontal pockets around each tooth. This measurement helps in assessing the health of the periodontal tissues and determining the extent of any periodontal disease present. The probe typically has calibrated markings that allow for accurate depth measurement, providing critical information about how much attachment has been lost due to periodontal disease.

While other instruments have their specific functions within dental practice, they do not serve the same purpose in assessing periodontal health. For example, the explorer is primarily used for detecting caries or irregularities on the tooth surface. The scaler is used to remove calculus from the teeth but does not measure periodontal attachment. The mirror is a diagnostic tool for visibility and reflection in the oral cavity but is not involved in periodontal assessments. Therefore, the probe stands out as the essential instrument for evaluating periodontal attachment loss.