Can You Widen the Length of Your Lips?

When I have my mouth closed, the length of my lips from side to side is extremely short (ie. around the span of my nose). I have heard that there are ways of correcting this that are similar to that used for a microstomia (commissuroplasty) where corners of the mouth are taken back. Do you think this would achieve a good result? Also, when I smile would the muscle pull from the new corners of the mouth or where the old corners of the mouth were... this is my main concern? Thanks in advance