There is some headcanon that the supersoldiers' teeth grow back (like Witchers). But if food gets stuck in my teeth it drives me crazy. So maybe Steve is trying to get the turkey out. :)

I had to actually watch more than one instructional video to try and get Bucky posed correctly. :P
As for the trial size dental floss, we have a hundred of those laying around because my dentist gives us a goodie bag every time we go for a checkup. :D ..... I think there's a parable there about getting "old" but I'm not looking too hard at it!