No you cannot assume your doctor knows best or even tries to do what's best for you. These people are busy working and thus may not have much time to look up scientific studies, they just follow their education.
They also make a lot of errors which can be partly mitigated by making sure to always get a second opinion.
If the probability for your doctor giving one particular incorrect advice/diagnosis is X than the probability for two independent doctors making said error is X², this will mostly protect you iff most doctors actually give you a correct diagnosis or are inconsistently wrong (both diagnosis you incorrectly but differently).
A far better way to protect yourself is to actually look into the science for your particular condition yourself. Does what your doctor recommend fall in line with the science? if not then it's likely you are dealing with a quack or someone who hasn't bothered to update his knowledge since he/she recieved his education which can be decades ago.
They also make a lot of errors which can be partly mitigated by making sure to always get a second opinion.
If the probability for your doctor giving one particular incorrect advice/diagnosis is X than the probability for two independent doctors making said error is X², this will mostly protect you iff most doctors actually give you a correct diagnosis or are inconsistently wrong (both diagnosis you incorrectly but differently).
A far better way to protect yourself is to actually look into the science for your particular condition yourself. Does what your doctor recommend fall in line with the science? if not then it's likely you are dealing with a quack or someone who hasn't bothered to update his knowledge since he/she recieved his education which can be decades ago.