I got two cavities filled at about 1 o'clock today, its six now and my lip is still numb, is this normal?

So like I said I got 2 fillings done today on the bottom right side, right next to each other and the area is still numb! that was about 5 hours ago.lol. I was at first numb all the way from my ear to just below my nose now its just more like half my cheek and 1/2 my lips.