Reports of illegal teeth-whitening that could leave patients at risk of health problems including burns or lost teeth have increased, the BBC has found.
General Dental Council (GDC) figures showed a 26% rise in reports last year.
Teeth-whitening can only be performed legally in the UK by professionals registered with the GDC.
One beauty school claimed to have provided “thousands” of candidates with illegitimate qualifications, an undercover investigation found.
Failure to comply with the requirement to be registered can result in a criminal record and an unlimited fine.
Untrained beauticians using teeth-whitening kits have been known to cause tooth loss, burns and blisters.
Dr Ben Atkins, president of the Oral Health Foundation, said: “When things go wrong in dentistry, they can really go wrong.
“I’ve been that dentist with the full