DH was looking after DS (13 months) today and he fell this morning and now has a very swollen lip. He didn't hit anything when he fell so we think it was just a tooth that hit the lip. I've just come in from work and it really is very swollen. He's also dribbling a lot as his mouth is open as a result of the swelling. DH thinks it's nothing to worry about and the swelling will go down overnight. I thought I would ask wise Mumsnetters for their thoughts. Should we get it checked or will it just sort itself out?