Maybe try contacting Trading Standards seeing that the patient has paid for the stated results but didn't get them.
Either false or misleading information is being given about the results that can be achieved.
It's worth a try
I have found out a Clinic that is doing tooth whitening. Its offereing Whitening for £99. Called NuBlue. You can only access the site via facebook. The GDC have been informed of this company but as yet i havent heard any thing back form them We have had a new patient come to us. Who had been there she had spent £99 and saw no difference.
Can any one think of another way we can prevent this company from doing any more whitening.