I'd like a second opinion, was the dentist supposed to stitch this while it heals? (Photo)

I had an extraction today and the dentist put in a graft so that at some point I can get an implant. He did not use stitches and I was wondering if that is normal? He did not explain how I am to care for this and it seems like all the pictures I’ve seen show this with stitches. Should I go back in or is this normal