Dental patients in Cavan and Monaghan are paying up to €60 more for fillings depending on what surgery they attend.
A survey of dental costs has uncovered significant variations between counties and even surgeries in the same area.
Dublin had the highest price for a filling, costing patients 170 euro at a surgery in Blackrock, compared to 35 euro in Donegal.
The research from the Irish Independent found that in Cavan, a filling could cost between €125 and €65, while in Monaghan it could be as high as €110 with the same lower price.
It was suggested that prices in the border region are competitive to match surgeries in Northern Ireland.
Fintan Hourihane, chief executive with the Irish Dental Association, says the costs involved can have a big impact:
