What is Corsodyl Mint Mouthwash? Corsodyl mint mouthwash is a specially formulated medicated mouthwash that can be used as an aid to help treat and prevent gingivitis, or gum disease.USES- treat and prevent gum disease-9where gums may bleed when brushed) -promote gum healing after dental surgery or treatment. -control mouth ulcers - maintain mouth hygeine - manage oral thrush and denture sore mouth.you can use corsody if you are pregnant or breast feeding.   Directions for use- use twice a day. rinse mouth with 10mls for 1 minute then spit out.