While Betadine (povidone-iodine) is a good antiseptic, it may not target the underlying cause of your sores, and smoking can significantly delay your mouth's natural healing process. Frequent mouth ulcers require a professional look to rule out infections or nutritional deficiencies. Please consult a dentist or doctor. They can properly evaluate the sore and suggest targeted treatments, like protective oral pastes or specific rinses, to help you find lasting relief.
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Why is my tongue sore not healing despite using Betadine gargle twice a day, especially since I smoke and get mouth sores four to five times a year?