'Accomplished fraudster' Charlie Von Klemperer advertised his services in West Sussex but was not registered with the General Dental Council, as he should be to operate legally.
Portsmouth Crown Court heard he had repeatedly tried to register with the regulatory body under different names but ploughed on, insisting he was qualified but the organisation was just being 'difficult'.
The 66-year-old repeatedly retched and vomited in a bin in the dock as prosecutor Christopher Prior outlined the case against him.
Mr Prior revealed Von Klemperer advertised in the Littlehampton Gazette targeting senior citizens.
But complaints to the regulator from one pensioner, who had responded to the advert, led to an investigation.
Mr Prior said the woman had paid Â£225, with Von Klemperer '“Â calling himself Jonathon Smith '“Â coming to her home to measure the dentures and returning after having made them.
The defendant periodically wailed in the dock, slumped in his chair throughout the hearing.
A sting operation by the GDC saw an investigator contact the unregistered dental technician and arrange to meet him at a care home in Bexhill-on-Sea.
'An employee contacted the man purporting to be Mr Smith and arranged for him to attend a care home in Bexhill-on-Sea.
'She gave the impression her mother required a new set of dentures.
'The defendant attended purporting to be Mr Smith, confirmed that he was a dental professional, thus giving rise to the fraud.
'He was arrested and gave his name as Von Klemperer.
'In searching his property a record book, a diary, was found '“Â there were a great number of names.'
The court heard all the clients were contacted, with a further two victims of the denture fraud.
One victim lost Â£400 and another was charged Â£399 but did not pay.
Sentencing, judge Timothy Mousley QCÂ handed the defendant a 12-month community order, 20 rehabilitation activity days and 150 hours of unpaid work.
Addressing the defendant, judge Mousley said: 'The letter you've written me (shows) remorse '“Â I have some hesitation accepting that as genuine, as of course, the letter is written by someone who is an accomplished fraudster and has been for most of his life.'
After he was sentenced, Von Klemperer, of Broadwater Down, Tunbridge Wells, Kent, said: 'May I say thank you, I'd just like to say thank you very much indeed your honour.'
Von Klemperer, who admitted three charges of fraud in 2016-2017, has now trained in podiatry and is making Â£3,000 a month while also practising as a foot care specialist.
He suffers from depersonalisation, anxiety and disassociation disorder.
Von Klemperer must now pay compensation in full to the victims.