she'll be crying and unable to settle down, most likely to be asking to see her mum, and if i was you, i would bring medicines. sometimes when you get a tooth taken out it might cause side effects like fever, he/she might not feel hungry throughout the day. that happens to some children it happened to me when i was 6. don't worry about it, she will feel better in 24hrs if not seek medical advice.
From my experience I have a young cousin who needed teeth pulled and they prescribed a very small dose of valium to ease the aniexty before going in and they still did the novacaine. he did awesome and there was no problems. Also had the little girl I babysat for get alot of teeth pulled and they just put her to sleep and gave her a pain med to keep the pain at a minimum
You should expect probably a crying and scared 4 year old. Just be patient with him and assure him that it's going to be fine :) Umm bring some toys maybe or a teddy bear that he can hold? I'm not sure but he'll definitely be numbed or even drugged a bit so he shouldn't feel anything....
-Crying -Tantrum -Screaming -Kicking -Yelling
What to bring: -iPod -Patience -Support