nope not necessarily. Things happen cracks that can't be seen via loops,X-rays or testing ( but cause bacteria leaking). Sometimes this just happens. Have had patients with no fillings at all. Minor cracks in tooth that could not be seen. Broke had to be extracted and replaced by an implant. RCT can get reinfected. No fault of the dentist. It's an infection. The mouth is the most bacteria ridden part of the body so infection of the weakest spot is inevitable.
Sent from my iPhone using Tapatalk