Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain a sore over the tongue which was previously like a slice over the tongue that is present since 2 and half months and is not completely healed, it can be due to a severe tongue bite or injury to the tongue leading to a cut on the tongue which is gradually healing.. But as it is still present since more than 2 months therefore, you need to consult an Oral Surgeon and get evaluated and he can do a biopsy of the ulcer and get evaluated and treatment should be proceeded accordingly.. As of now you should continue doing warm saline gargles and apply steroid ointment for relief.. Apply numbing gel containing Lignocaine for relieving pain.. Hope this information helps. Thanks and regards. Dr.Honey Nandwani Arora.