Dermal Filler using hyaluronic acid (HA) to the infraorbital hollows ("tear trough") is most easily placed using a blunt-tip cannula, rather than a sharp needle injection technique. The cannula technique is preferred by Dr. Michael Cutler. In contrast to HA filler to other areas, this cannula technique is painless or nearly so. Results last typically 12 months or longer. Dr Cutler prefers to use fillers such as Belotero and Restylane for this.