Modern Day Smiles Dentistry

I can not believe dentist would do such thing try to earn business. I went to see Lee David J located at 7002 Sheldon Rd, Tampa, FL 33615 for regular teeth wash. After the X-ray, I was told that one of my teeth was filled about 10 years ago was infected because of the filling was not done properly. I received Treatment detail plan to fix that tooth to do root canal therapy and crown for total of $1293. Even the cost is split between insurance and me, Since that tooth is not hurting me, I denied the treatment.

Later on I consult with my mother in law's dentist in NY on my visiting there; I was that I do not have to do anything if it is not giving me any trouble.

What big different between two dentists. I do not know much about dental, but I do feel like Dr Lee wants more business from customers instead of thinking for patients own benefit.
How can you trust such dentist this way.