Jacobus Marinus van Nierop, 50, was arrested in the small town, located west of Fredericton, on Monday, according to an investigator with the Gendarmerie Nationale in Chateau-Chinon, the Burgundy region of France.
But the officer declined any further comment, saying the matter is under investigation.
The fugitive, also known as Mark van Nierop, had been wanted since December on charges of violence causing mutilation or permanent disability and fraud after he allegedly pierced some patients' jaws with poorly placed implants, left parts of dental tools lodged in other patients' gums, and pulled out healthy teeth, Europe 1 radio has reported.
None of the allegations has been proven in court.
Van Nierop is scheduled to have a detention review hearing on Friday at 11 a.m. AT, said Immigration and Refugee Board of Canada spokesperson Charles Hawkins.
He is being detained for "immigration purposes," said Hawkins, who said he was unable to discuss the details until after the quasi-judicial hearing.
It will be held by telephone with van Nierop at the Southwest Nova Scotia Correctional Facility, Canada Border Services Agency officials in Halifax and the decision maker in Montreal, Hawkins said.
A summary of the facts and the decision will be made public following the hearing, he said.
Alleged victims 'very happy' about arrest
Canada Border Services Agency spokesperson Jennifer Morrison declined to comment on the case.
"It is not a practice of the CBSA to confirm/deny whether a person has been arrested and/or is under investigation," she stated in an email.
New Brunswick RCMP Cpl. Chantal Farrah also declined to comment.
Van Nierop was arrested at the apartment building he had been living in for the past eight months, according to people in the community CBC News spoke to on Thursday.
Nackawic Mayor Nancy Cronkhite said she only heard about the arrest through social media.
"I was not aware that this person even lived in Nackawic," Chronkhite stated in an email.
Van Nierop had previously been practising in Château-Chinon in Burgundy since 2008.
Local police started an investigation in May 2013, following numerous complaints from patients.
Nicole Martin, president of an association that represents van Nierop's alleged victims in Château-Chinon, said they are all "very happy" to hear about his arrest.
About 120 people were maimed by van Nierop's dodgy dentistry — "that we know of," Martin told CBC News through a friend, who was translating for her.
Martin said she was one of the luckier ones, having had two teeth pulled out when it was "not necessary."
But about 60 people were seriously injured, she said.
Château-Chinon had been without a dentist for about four years before van Nierop arrived, Martin said.