Just because they're a doctor doesn't necessarily mean that what they say is right!
"お医者さんの言ってることが正しいってわけじゃないよ!"
What doctors say aren't always right!
Doctors are not always right!
Just because they're a doctor doesn't necessarily mean that what they say is right!
Just because they're a doctor doesn't mean that they are right.
この場合、次のような言い方ができますよ。
ーNot everything doctors say is correct.
「医者の言うこと全ては正しくない」=「医者の言ってることが全て正しいわけじゃない」
ーDoctors don't get everything right.
「医者は全てを正しく理解しない」=「医者の言ってることが全て正しいわけじゃない」
ご参考まで!