Trimming cartilage from the caudal septum during rhinoplasty. How much is too much?

It is not how much was taken rather how much was left behind. In general we try to leave behind 6-7mm of cartilage and the rest is safe to take. It is not common to have the symptoms you are talking about from cephalic trim of your lower lateral cartialge. I would touch base with your surgeon and make sure you express your cocerns. 

That's a very important question. The symptoms you are describing are expected to a certain extent right after surgery. I usually tell my patients to use Vaseline in each nostril to help with the dryness and burning sensation. The removal of part of the caudal septum should not have any effect on airflow and sense of smell. Hope it helps! 

Trimming cartilage from the caudal septum or the lower lateral cartilages is commonly performed during rhinoplasty.  The amount removed is less important than the amount left behind.  The amount left behind is paramount for tip support and breathing.  Your decreased sense of smell should have nothing to do with the cartilage removed.  Often patients feel congested for a few weeks to months after rhinoplasty.  This usually resolves by itself.  You may want to try lining the outer edge of your nostril with aquaphor or vasoline to help with the dryness and burning sensation.  Best of luck!