You don't clean your mouth and bacteria are eating your teeth. There is now a big hole where there shouldn't be.
Consider yourself explained to
You weren't paying attention. I lumped dentist and car mechanics together.
It is not about understanding, it's about needing to trust someone to read the x-ray and see in my mouth.
No matter what I am told, I need to trust the professional. That professional can, if unethical, tell me anything, and I will have to trust. I will further need to trust for the procedure and work done, as I am unable to witness the work.
Unfortunately my experience has been negative. I have one pediatric dentist and one regular dentist that I trust. They have earned it after bad experiences with others.