My husband had a wisdom tooth extracted at Aspen Dental, and while the oral surgeon who did it (with sedation) was great, the office staff and billing department were absolutely terrible. They are absolutely scammers. They also sell your phone number and any other phone number you put down (emergency contact, for instance).
In the other dentist thread going on right now, you'll see a lot of people complain about the dental "insurance" company Delta Dental... if they had their own dental office, it would be Aspen Dental, that's the level of terrible.