Whenever I have had to have dental work done and needed pain meds, all I had to do was call my PM and let him know what the dentist was prescribing and for how long. He would just okay it and make a note of it in my chart....and that was the end of it.
Call your PM's office and ask them how they want you to handle it. Do they want your dentist to call, or have you call before you fill the script or do they want you to bring it in to show them? Each office usually has it's own protocals, but normally, it's just notifying them of the script, who gave it and why....