I had 4 fillings done on my top front teeth on Tuesday. I had 3 injections, one of them he moved the needle round a fair bit. At the site of that one, its incredibly painful and swollen. Could it be infected? I've never heard of it hapenning. I've tried to ring the dentist but they're permanently busy. If needed, I'll get in with the out of hours dentist later. Is there anything I need to do, other than swill with salt water?