galella? >> reporter: something we wanted to ask dr.ws. >> i can't talk to you. >> reporter: how can you feel comfortable using the device on patients when you have no proof, no studies that it works? dr. galella? >> reporter: last year, a judge ordered dr. galella to provide before and after scans from five patients to prove his device works. so cbs news and khn took those scans and asked eight experts from dental specialties and schools nationwide, including harvard and columbia, to review them. most said that expanding an adult's jawbone without surgery is physiologically impossible, and all said they saw no evidence that the agga works. >> the entire concept of this device, of this treatment makes zero sense. >> they didn't grow bone in these patients. what they ended up doing was losing bone. >> it's certainly not going to do what it claims it's going to do. >> i've not seen one patient that has had anything good come from this device, nothing. this is snake oil. this is -- this is crazy.r: kry her mth and jaw now at $150,000. plus

galella? declined to answer questions last month. >> i want to ask you about your device. >> reporter: the fda is evaluating whether it wants to investigate the agga device. but the las vegas institute, a training company that previously taught dentists to use the agga now trains dentists to use the an tearia remodeling appliance, or ara, which its ceo has described in facebook posts as almost exactly the same appliance. and dental specialists we spoke to say they are similarly concerned than device too. former patient hopes the fda will look into not just the agga, but other devices as well. >> i think people deserve to know what it is they're buying into and what it is exactly it's going to do for them or not do for them so they can weigh the benefits and risks. >> reporter: dr. galella through his attorney again declined to answer questions for this story. his attorney previously told us the device, now called thes owe restoration appliance, when properly used is safe and can achieve benefi