Seems only interested in getting through your insurance allocation at the expense of your teeth.
One of my children was told they needed multiple fillings, we went for a second opinion at a pediatric dentist and they needed NONE! My spouse had her first filling ever here and in teeth that were not problematic until after they were filled.
Before you have a filling replaced make sure you tell them that if a crown becomes necessary you will be getting a second opinion.
The dental hygenist is very good and thourough, but not worth the anxiety of the regular dentists seemingly unethical practices.