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When is the last time that you had a dental check up? Is there any swelling or could you submit a picture of the area so I could review? What have you been taking for pain, and how long has it been painful?
What are you looking for in regards ***** ***** on this tooth?
You will need to see a dentist for an exam and xray of the area. Since the tooth is hurting on the outside of the tooth it could be a number of different things, deep cavity, irreversible pulpitis, periodontal infection, etc. If pressing or touching that area replicates the pain, it is extremely likely that the tooth needs dentist/professional diagnosis and treatment. Feel free to ask whatever info you need I'm here to explain.