During active periodontal treatment, the clinician re-evaluates the patient's oral hygiene and periodontal status before deciding whether to proceed further. What phase of periodontal treatment planning does this fall under?

The disease control (also called active or etiotrophic) phase of periodontal treatment focuses on eliminating disease-causing factors (plaque, calculus, local irritants) through patient education, scaling/root planing, and re-evaluation of the patient's response — including reassessing oral hygiene and periodontal status before deciding whether to proceed to a corrective/reconstructive phase or move toward maintenance.