My daughter has recurring abcesses. some nerves have been taken out of her teeth, but the abscesses are still recurring. they appear all over gums, sometimes 2 at atime. what should i do?

Mouth ulcers?: If the "abscesses are appearing all over the gums, my first thought is that you are not dealing with infected nerves, but most likely a virus-mediated ulceration or ulcers induced by some food(s). If your dentist has been treating this with root canal therapy, maybe you should get a second opinion from a gum specialist?

See a good dentist: It is hard to say what all is going on here. Her problem may be related to diet, hygiene or she may just have a lot of cavities. The best thing to do is make sure that she is seeing a good dentist, brushes and flosses daily, and avoids sweets including sugary and acidic drinks and candy.

Viral or bacterial: Unusual to have recurrent bacterial infections especially if teeth have had root canal rx, unless your child has multiple cavities and more teeth are infected. May be bacterial gum disease, may be viral herpetic lesions. You might want a 2nd opinion with a pediatric dental specialist of a periodontist.