A study for the Irish Dental Association has found three out of four dentists are treating patients for problems arising from treatment abroad.
IDA President Dr Donal Blackwell said it was the strongest evidence yet of poor dentistry carried out abroad.
In recent years, an increasing number of Irish people have availed of dental treatment abroad as they cannot afford to pay for the treatment in Ireland.
The results are based on a survey of 440 private Irish dentists.
A total of 76% said they had to treat patients for a wide range of clinical problems, including acute pain, infection, breakage of restorations and poorly-fitted restorations.
Dr Blackwell said the problems were due to a large amount of work being done over a short time.
He said there were also problems with 'over-treatment', as patients received unnecessary work on teeth.
Dr Blackwell said the study reinforced warnings against 'dental tourism'.
