I️ had a new crown installed 5 months ago and ever since I️ have had sharp pain when biting. I️ have been back to the dentist 5 times to get my bite adjusted. This last visit (#6) no bite adjustment needed, x-rays are fine and doctor prescribed antibiotics to see if it is my sinuses. I️ finished the antibiotics and the pain is not better when I️ nite. Would sinus problems cause a sharp pain only when I️ bite down? Or do I️ need a second opinion?