“Can gum recession be fixed with injections?”

Injections of what? It also depends on the reason for the gum recession. There are a number of ways of dealing with recession. Your best bet is to check with a periodontist. Good luck. Please note: message attached

No. However there is a technique called "Pinhole Surgery" that can repair gum recession, but only after stopping the main cause of the recession. Be sure you research and find a dentist that is certified in the Pinhole Surgery technique after getting the recession and any evidence of periodontal disease under control. Pinhole surgery is a very specific and complicated procedure, so allowing a dentist not properly trained in this post graduate course could result in serious complications.

Gum recession can be fixed with grafting, or flap procedures.