There may be some sensitivity and irritation after the temporary or permanent is placed. This is normal and will subside after the soft tissue heals. A warm salt water rinse will help, and you can also take Advil or Tylenol if the pain does not go away.
When the veneer is placed it may feel a little awkward for a few days. Your mouth needs to adjust to the new tooth, and it should feel like one of your natural teeth in less than a week. If your bite feels abnormal in any way, you should let your dentist know. When brushing and flossing you should pay close attention to the area between the veneer and the tooth at the gum line.