Dear s.lin, It is not uncommon following the deployment of soft tissue fillers to still have residual aesthetic concerns. The corner of the mouth particularly the downgoing corners of the mouth called the commissures and the Marionette lines, those deep furrows below them add a “mouth frown” or sad and droopy appearance to the face. Soft tissue fillers and the Marionette lines and at the parasymphyseal region with direct support of corners of the mouth is usually quite successful. However, when there is still a residual down turn to the corner of a mouth as you have on the one side, a small amount of soft tissue filler particularly within the dermis of the corner of the mouth may be necessary. In addition, the use of Botox, Dysport or Xiomen which block the muscle that pulls down the corner of the mouth called the depressor angularis oris may also be adjunctive and necessary to horizontalize the commissure. Creating a horizontal corner of the mouth and improving the Marionette line will improve that sad, “mouth frown” and droopiness of the face. Over time and with age even soft tissue fillers may not correct this fully and suture suspension techniques or thread lifts and even mini lifts of the cheek may be necessary to reposition the corner of the mouth. Most patients get good success and start with soft tissue fillers and it sounds like you have almost achieved your aesthetic goals and at this time, I would seek the advice of your soft tissue filler injector and see if a small enhancement without looking like “filler face” can be achieved or if the addition of a product like Botox may be adjunctive and necessary. I hope this information has been of some assistance and best of luck. For more information, please review the link below. R. Stephen Mulholland, M.D. Certified Plastic Surgeon Yorkville, Toronto