I've been to another dentist and they said things completely different. I don't understand how two professionals can draw polar opposite conclusions. I

I've been to another dentist and they said things completely different. I don't understand how two professionals can draw polar opposite conclusions. Isn't there some kind of solution for these sort of diagnostic aberrations or difference in medical opinions? I know they have tumor boards for cancers and such where they try to arrive at a consensus plan of treatment for an individual patient.[1] Surely there are such solutions for dental / other medical issues, right? Somewhat tangential from all this, I'm amazed that in this day and age we still have such a hit or miss approach to treating patients. Its mind blowing how little our medicine has advanced in some aspects despite cutting edge innovations. [1] What Is a Tumor Board? An Expert Q&A https://www.cancer.net/blog/2017-07/what-tumor-board-expert-qa https://www.cancer.net/blog/2017-07/what-tumor-board-expert-...