Watch the needles. The first injection I got for my fillings was waaaay deep in my jaw and it didn't numb anything. I was holding my mouth wide open for a while so I wouldn't relax and snap the needle. I ended up and am still a little sore. The second was was ok and really did the job but she kinda jabbed it in there and gave my tongue a zing. I always worry about nerve damage when those injections go in. It may be routine, but there is always potential for damage if a nerve is hit. Hopefully the soreness in my jaw subsides from the first injection.
Overall the 2 fillings were quick and painless and seem to be doing the job they were meant to without any sharp edges or rough spots.