Fixing downward awkward smile: My mouth turns downwards a lot when I open my mouth. (Photos)

Thank you for your question. Surgical and non-surgical treatments (including fillers) are the treatments that can fix a downward smile. I suggest that you consult with your board certified facial plastic surgeon.
Best wishes,

A combination of fillers at the angle of the mouth in conjuction with some botox can be a very effective treatment. Lip augmentation is a very common producedure and can acheive a nice natural look by using a combination treatment. Be careful with who is performing the procudure as it should be an experienced physician.