Hello, Severe chemical damage to the surface of the tongue where there are taste buds can be permanent. You were given anti-inflammatory medication, eliminated the chemical and now must keep the area clean for healing. Are you having difficulty healing with any ulceations? You need to watch for an additional oral infection such as thrush. Anti-fungal medication such as Nystatin would be necessary. Antibiotics could be required due to complicated healing. Gentle oral care along with warm salt water rinses will assist and soothe the tongue. Keep well hydrated and proper nutrition. Avoid vitamin deficiencies. Spicy and acdic foods may cause irritation. I suggest you have your dentist evaluate and monitor the surface of the tongue. I think you can have a positive outlook and realize with more time, more taste sensation should return. Your exposure sounds limited. Knowing the exact chemical would be helpful. Ruling out an allergic reaction would also be suggested in the case of a flavored tea, etc. Thank you for your inquiry. I am glad to provide additional assistance if you have more questions.