Please help. My dentist says that I have 4 teeth, all have had root canals and have a cap, that are badly decayed under the cap and have to be pulled. He's afraid they may break off. How would he get the tooth (roots) out if the tooth breaks off? Will I feel anything? Also, I have a tooth that has already broken off, at the gumline, that he says needs to come out. How will he do this, as the only thing there is the roots?

Twenty years ago if I would have known that the tooth can decay under the caps, I would have just had them pulled. Does this happen often? Thanks in advance.