Loss of taste along with a sore inside the cheek and burning while eating spicy food can happen due to mouth ulcers, vitamin deficiency, acidity, fungal infection, irritation from sharp teeth, tobacco use, stress, or viral infections. When the problem continues for nearly a month despite using Kenacort, Orasore Gel, and B-complex capsules, it is better not to ignore it because persistent mouth sores sometimes need closer examination. Very spicy, sour, hot, or packaged foods can keep irritating the sore and increase the burning sensation. Drinking enough water and maintaining proper oral hygiene may help the mouth heal more comfortably. Sometimes repeated friction from a tooth edge or dental issue can also prevent ulcers from healing properly. Medicines and oral gels may help temporarily, but the exact treatment depends on the actual cause. If the sore becomes larger, starts bleeding, develops white patches, causes difficulty swallowing, or the taste loss keeps worsening, consult a doctor.