One of the more delicate moments in an injecting practice arrives when a loyal, previously-happy patient says their neurotoxin "stopped working." It feels, to them, like something went wrong — like they got a bad batch, or you did something different, or their money was wasted. How the practice handles that moment determines whether the patient leaves feeling let down and suspicious, or leaves trusting you more than ever because you handled their concern with competence and care. Neurotoxin resistance, real or apparent, is as much a counseling and retention challenge as a clinical one, and owners should understand both halves.
This is general education for owners, not medical advice. Clinical assessment and treatment decisions belong to trained providers.