Hello, I would suggest reducing the bite on the crown as a first step to evaluate if this gives any relief. An older crown may have decay underneath the crown which is not visible on X-ray, but has caused an abscess. A new crown can also have an abscess underneath the crown. Treatment options include a root canal. Some root fractures are difficult to diagnosis with X-rays. Consult a root canal specialist if the tooth already has a root canal or you want another evaluation and testing of the nerve health. More details involving the crown placement and dental history with X-rays would allow me to give a more detailed response. I suggest a combination of Tylenol and Advil taken at regular intervals for relief of severe pain. Orajel can burn the tissue. Antibiotics are usually prescribed for infections and can take more than 24 hours to be effective. Sometimes a different antibiotic is necessary to treat a resistant infection. Are there periodontal conditions to be concerned about? Was there an event that made your husband think the crown was cracked? I am glad to assist further and thank you for your inquiry.