What other options should I consider for this dent in my face if the saline injection doesn't work? (photos)

Administration of saline cannot possibly correct the volume loss created by a steroid injection. Saline is only used to determine if increasing volume in any given area allows the skin to pop up into its normal position while creating a short-lived improvement. If saline does push out the skin, then you can definitely can undergo a filler injection to correct the issue or better yet after a few months have the area filled with your own fat for permanent and natural results. I hope this helps and good luck from New York City Plastic Surgery

I recommend subcision of the indented area with nano/micro fat grafting of 2-5 cc's. Maybe HA fillers could help or even Sculptra injections. This also could take a few sessions. Expect fees in the $3,000+ ranges.