Only one in six dental practices in Wales are offering treatment to new adult patients on the NHS, according to research by the British Dental Association (BDA).
It also found just over a quarter of 355 dental practices in the country were taking on new child NHS patients.
The BDA is campaigning for a change in the way dentists are paid, which it said has caused an “access crisis”.
The Welsh Government said it was reforming the contract with dentists.
A large variation between different health board areas was found by researchers when they contacted practices in April.
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