I have adopted a 7month old rabbit who had the same problem. His bottom incisors have been removed and he eats just fine (however, will need possible syringe feeding after the dental). He has one top incisor left which will need extracting too but didn't happen at the time of the bottom ones because of his anaesthetic. Keep in mind that there is a risk with the anaesthetic but it is also a risk to stress your bunny out every few weeks to get them trimmed. Like I say, my young bun is doing well after the removal of the bottom ones.