Metrogyl DG Gel Forte contains metronidazole and chlorhexidine, which target bacteria, but many common mouth sores are inflammatory, which is likely why you haven't seen relief yet. To help you eat, you can try a local anesthetic gel containing lidocaine applied directly to the sore before meals to temporarily numb the pain. Gently rinsing with warm salt water and avoiding spicy or acidic foods will also help. If the sore does not improve in a few days, please see your doctor or dentist for an evaluation.
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What should I do if a painful mouth sore is making it hard to eat, and using Metrogyl DG Gel Forte for the past three days has not helped?