I am sorry but I cannot speak to you on the telephone. I know the site offers this service but the site is based in the US. As I am a lawyer in Canada the rules of my law society prohibit me from speaking to you on the telephone as you are not my client.
I can only speak to you by posting up and back over this site.
I am sorry for the delay. I had a meeting that started earlier than I had planned unfortunately.
First, you should know that they cannot sue you for the money even if you did owe it as the limitation period for suing you is two years.
Second, what you can do is go through the formal complaints process with the credit bureau. Explain the facts as you did in your post now but do it in much more detail. Make sure you explain that you were not the child's legal guardian at that point, you never took the child to the dentist, you never spoke to the dentist and most assuredly did not agree to pay any fees.
Make it clear that the debt is simply not yours.
If that doesn't work have a lawyer send a letter to the dentist indicating that if your credit rating is not improved immediately by the removal of the report you will sue the dentist for damages for harming your credit rating.
Does that help as a starting point?
Please feel free to post back with any follow-up questions you may have. If you don't have any then I hope I have earned a 5 star rating but if you don't feel that I have please don't hesitate to reply back and let me know what more I can do to assist you. Finally, please know that even after you rate me I will be here for you and you can ask follow-up questions if you think of them later on at no further charge of course.