What's the best treatment for lip incompetence? (Photo)

The first step before any treatment is diagnosis, and a thorough history (how long you've noticed it, how it bothers you, any associated symptoms or difficulty, others in family who may have or have had it, etc.) and physical examination (skeletal, dental, soft tissue, both at rest as your photo shows, and with animation such as smiling) are the cornerstones for gathering information leading to diagnosis.  Special studies (x-ray, cephalometric analysis) may also be indicated.  It may be that an orthognathic approach to reduce your vertical maxillary height is appropriate rather than directly treating your lips.   Consider personal consultation with a specialist in maxillofacial surgery. 

You should start out with 1cc of filler and go from there. You do not want to overdo too much filler in the lips. It also depends on the look you are going for too. You can always add more filler to the lips if needed. Just remember if you are going to do your lips and you do not want to bruise you should not take any aspirins or anything that will thin the blood since brusing can occur.

fillers, fat and implants can help but i thin the whole lip area including the surrounding lip needs to be treated with fillers properly / sculptra and lasers.  Ultherapy will lift. this will make the entire unit appear more youthful.  Please see an expert.  Best, Dr. Emer.