I'm sorry to hear that your mouth ulcer is causing discomfort and that the treatments you've tried so far haven't helped. Mouth ulcers can be painful and persistent, but there are several approaches to manage them effectively.

Here are some suggestions you might consider:

• Maintain oral hygiene: Gently brush your teeth with a soft-bristled toothbrush and avoid spicy, acidic, or rough-textured foods that can irritate the ulcer.
• Topical treatments: Besides the gel you tried, antiseptic mouthwashes or corticosteroid ointments prescribed by a doctor can reduce inflammation and pain.
• Pain relief: Over-the-counter pain relievers like paracetamol or ibuprofen may help ease discomfort.
• Nutritional support: Since you have tried Becosules (a vitamin B-complex and vitamin C supplement), ensure your diet includes iron-rich dals, green leafy vegetables, and seasonal fruits to support healing.
• Avoid irritants: Refrain from tobacco, alcohol, and very hot foods or drinks until the ulcer heals.

If your ulcer persists beyond two weeks, worsens, or is accompanied by other symptoms like fever or difficulty swallowing, it is important to consult a dentist or an oral medicine specialist. They can evaluate for underlying causes and may prescribe stronger medications or investigate further.

Please consider seeing a specialist to get a tailored treatment plan for your mouth ulcer.To narrow down potential causes, we will need some more information.Please tell me your age and gender.