I was a patient; had a root canal; had 3 followup visits, during each I was told everything was fine. The last visit , a year after the root canal (and my tooth was still as sore as before the root canal), Dr. Topcik said I should "get on with life."
My periodontist then found that I had infection (which he surmised had been there all along) and a crack in the tooth which, ostensibly, had been there all along as well.
I requested some rebate from Dr. Topcik; he refused me.
In all fairness to him, the root canal was probably done correctly, but should never have been done, with the tooth being in the state that it was.
Now I'm undergoing a $3,000 tooth removal, bone graft and implant.
Never would I have spent some $1700 (endodontist & dentist charges) for a "maybe" fix, when $3000 would have done the job permanently.