Hello 'Chloe625', thanks for your question.  Airway obstruction is fairly common and can be due to any of a large number of factors.  Some of these causes include simple allergies to pollen or dust, leading to swelling of the nasal mucosal lining, anatomic deviated septum, post-traumatic nasal fractures, post-rhinoplasty stigmata with deficient cartilaginous support, and chronic sinusitis, just to name a few.  It is difficult to say for certain which of these is the culprit in your particular case without a thorough history of your issues and physical examination.  In addition, the best imaging study to evaluate your nasal anatomy would be a CT scan.  Unfortunately, an X-ray study does not provide the detail necessary to evaluate your nasal septum, especially a dental panorex film that you have obtained.  If you are concerned about your breathing, especially if there are additional cosmetic changes you are looking to make (such as a dorsal hump reduction or bulbous tip refinement), I would recommend consulting with a board-certified plastic surgeon who can perform a thorough examination and go through the options with you.  Hope that helps! -Dr.92660