What the fat lip??

Mabes had a dentist appointment and she had a few little cavities...So they numbed her lip and told me to watch and make sure she doesn't bite her lip. Easy enough right?? So we go home put on a movie and I give Mabes a sippy cup of her milk and sit down to watch the movie w/ her. Not even 15 min into the movie and I look over and see something growing on Mabrys lip. GRIPES!! She had been chewing on her lip the entire time. (mother of the year) I gave her some ice to suck on for the swelling and it helped a little. Good Grief...It took a full week for that pucker lip to go down. Poor thing!