Well, first my dentist tells me I'll probably need a root canal, while we're waiting for the xrays to develop. Then, he isn't sure which tooth is is, and then he isn't sure if it's a tooth abcess or a periodontal abcess - where it's just the gum. So he sends me to a root canal specialist, who later hands me over to his periodontal specialist, and right now the plan is to put me on antibiotics until the swelling goes down (which is happening) and then see if they need to remove the tooth. They're pretty sure that's a given because of other reasons.
So . . .three dentists, two prognoses, three possible outcomes.