Hi.. Thanks for the query.. Sore throat and bad taste in mouth can be due to causes throat infection, tonsil stones, Sinusitis, post nasal , Oral and dental infection, dry mouth, side effect of medication etc.. I would suggest you to consult an Oral Physician and get evaluated and a thorough clinical evaluation and investigation as per suspected cause can help in diagnosis and treatment can be done accordingly.. As of now you can start gargling with flavoured antimicrobial mouthwash.. Chew flavoured sugar free chewing gum.. Do warm saline gargle.. Clean your tongue using a tongue cleaner daily so as to avoid any debris particle accumulation over tongue Hope this helps.. Regards..