Is It Common to Cut my Frenulum During a Rhinoplasty?

As stated best to call your operative surgeon to discuss this issue. But 5 years I doubt he would remember if it was done and why, but worth a call. 

It is not standard practice to do this.  Have you had any other procedures since then, including dental work?

If not, you may want to check with your doctor how the procedure was performed, and what he was trying to accomplish by performing this maneuver.