All of the following are recognized treatments for acute necrotizing ulcerative gingivitis (ANUG) EXCEPT:

ANUG is typically diagnosed based on its characteristic clinical presentation (punched-out papillae, grey pseudomembrane, pain, fetid breath) without requiring biopsy. Standard treatment includes gentle debridement/scaling and root planing, chlorhexidine rinses, and antibiotics (classically metronidazole) for patients with systemic symptoms — biopsy is not part of standard ANUG management.