CASE 1: Mr. Bernard Okafor, a 57-year-old man, has end-stage kidney disease caused by hypertension. He receives hemodialysis on Monday, Wednesday and Friday mornings through an arteriovenous fistula in his left forearm. He takes amlodipine, calcium carbonate with meals and an erythropoiesis-stimulating agent. He has an ammonia-like breath odour, pale oral mucosa, generalized bleeding on probing and probing depths of 4-5 mm. Mr. Okafor needs two appointments for quadrant debridement. When is it most appropriate to schedule them?