Chlorhexidine digluconate. Bleeding Gums. Irritated Gums. Mouth Ulcers. TREATS GUM PROBLEMS. What is Corsodyl Mint Mouthwash for? The active ingredient is chlorhexidine digluconate which is an antibacterial agent that reduces the formation of dental plaque and is used to: Treat & prevent gum disease (where gums may bleed when brushed). Promote gum healing after dental surgery or treatment. Control mouth ulcers. Maintain mouth hygiene. Manage oral thrush and denture sore mouth.