Does nasal cartilage heal back to its original form?

Not necessarily. Cartiladge has a poor blood supply & depending where it is located can be disfiguring if traumatized. It is important to have it replace to as much of the original position as possible and be followed by a reputable ENT or plastic surgeon. Splinting is important. Sometimes a re-do is necessary or further surgery and splinting. Deformity may be expected but perhaps doesn't have to b permanent.
Not specific enough. The question you ask is too non-specific. If you have had an injury to the nose, the cartilage will probably not return to its original anatomical position. If you have had septal cartilage surgery, again, it will not return to its original position. Could you possibly be more specific as to the specific reason for asking this question. Thank you.