Hello, Quite often sensivity afterwards can be due to some soft tissue trauma. Usually some discomfort is noticed when numbness wears off. Giving time to heal, avoiding the areas, soft diet and warm salt water rinses usually allows a complete recovery. Sometimes you can repeat injuring some inflamed, swollen tissue and have this delayed response due to new trauma. Since you were placed in an antibiotic, is there any periodontal concern or any chance of the tooth having an abscess? I prescribe antibiotics only when there is infection present. Monitor for increased swelling, hot sensitivity and a reaction to pressure. Return to the dentist for further evaluation if symptoms persist. Does your bite feel ok? Sometimes a high filling causes discomfort and a change in your bite. A simple adjustment will relieve symptoms if this is the case. Ask to have your bite checked. I hope this is helpful. Take some antiinflammitory medication if needed for your discomfort. Thank you for your inquiry.