It means this office doesn't show on the insurance's preferred provider list.
You can still go to this office. This office will file a dental claim for you as if this office is in network and your dental insurance will reimburse accordingly.
All insurance should pay covered benefits whether the office is in network or not. Preventive benefits like cleaning cover 100% for the most part.
It's not easy to find a dental office you trust or like.
Is it worth going to a different office simply because your go-to office is not in network?
It's complicated. I understand that.
I just want to emphasize you go to a place where you know you are taken great care of!
Don't listen to what they want to say. They have obligation to pay. They want to pay less on your covered benefit.
Life is too short to be dictated by those insurances!