I rarely do this technique. However, you are correct, you can actually raise the tip of the nose a bit even when you don't smile. It lasts about 2 months in many cases and I think it is unpredictable and a waste. It can also spread to the upper lip and drop the lip a tiny bit and also can affect the nostrils by slightly splaying them at times as well. hope that is clear.
best, nose right scam