It was also alleged that using a prescription pad in someone else's name, he has prescribed antibiotics and pain killers.
Dr Ross said he was concerned that a large number of people might have been exposed to blood-borne diseases such as Hepatitis C or B, or other cross-contamination of infection risks.
They could also have inadequate or incorrect dental work, which could cause injury and infections, he said.
However, he had no idea how many people might have health problems stemming from the dental work.
Mr Vailea's patients were probably solely of Tongan descent, he said.
Dr Ross urged anybody treated by Mr Vailea to contact the Pacific Health Unit at Middlemore Hospital.
"We are very concerned that incorrect dental work and potential exposure to cross-contamination of infection could lead to long-term teeth, gum and health problems.
"It is very important that anybody who has been treated by this man come forward for advice," he said.
He said the hospital would perform any blood or dental checks that needed to be done.
Mr Vailea's alleged offending came to light when a patient unhappy with his dental work complained to a person who had dentistry knowledge. That person urged the patient to go to police, Dr Ross said.
"That's what opened the box and then they did some more investigating."
Mr Vailea will appear in court later in the month.
People who have been treated by Mr Vailea can call the Middlemore Hospital Pacific Health Unit on 09 276 0044 ext 9006 between 8am and 4.30pm.
* Have you been a patient of Sione Vailea? Please send your story, photos or video to John Weekes.