A common question I get asked is whether the nose appearance will change after this surgery. The answer is no (if correctly done). In fact, if the nasal appearance DID change afterwards, you would also have undergone rhinoplasty nose job... or too much was unintentionally removed.
The explanation for why the nasal appearance does not (should not) change after septoplasty is actually quite simple. The analogy would be a house where the appearance on the outside would not change even though you may knock down a wall between two rooms inside the home.
SO... Here is a side view of the septum. The blue arrow is pointing to the nostril opening and the red arrow is pointing to the lip.
As you can see, the outside appearance of the nose remains unchanged as the rim of the nose is kept intact as shown by the red arrows here:
Read more about the septoplasty surgery here.
Some nice nose job videos: