Came here for the groupon special at around August 2017 for a clean up since I didn't have insurance. After the cleaning they gave me a visual inspection for cavities and said I had about $1500~ worth of cavities.
I now have dental insurance so I went to my network dentists and they said at most I only have $300 worth of cavity damages at most (my old cavities needed to be refilled) but even then the damage is really just cosmetic with only 1 being serious.
If this is your regular dentist then it's probably fine since they did seem professional and courteous when I did the cleaning. But if you're here for the groupon, just make sure they don't trick you into paying for something you don't need.