There are many factors involved in oral health or lack of. An individual can end up with one or two cavities if at all all their lives, where another can be having to treat a host of diseases during heir life time as they are frequent fliers to the dental office.
theses factors are...
You would need a 3D Cone Beam Scan to determine if there is another canal that might have been missed during the root canal treatment or there is a root fracture. Regular x-rays is two dimensional and sometimes the dentist will miss the additional canal during treatment.
Typical...
Hi Kelsey...since you have 30% of the tooth structure left, it seems that your dentist's recommendation of placing posts in the crowns will help strengthen them. Your front teeth experience a lot of force and stress and you want the crowns to last. I would go with what he recommends!