DENTISTS in Huddersfield are warning they will quit the NHS because of delays in sorting out new contracts.
The new deals are due to come into force on April 1.
Huddersfield MP Barry Sheerman has raised concerns with ministers.
He said: "It is clear that primary care trust staff are working flat out with dentists to try and implement the new contracts.
"There are, however, still serious concerns about insufficient time and resources to implement the new contracts."
The MP has arranged to meet health staff after letters from dentists concerned about the new contracts.
Dentists said they were being given little time to consider the details.
The British Dental Association says a climate of uncertainty and confusion remains over major changes.
Mr Sheerman said: "I fully support the intentions behind the Government's new contract, which are to ensure a stable NHS income for dentists, encourage a preventative approach and provide a simpler and fairer system of charges for patients.
"However, dentists have already said it would be difficult for them to take a preventative approach with the new contracts.
"Therefore it is essential that the Government addresses the problems with the implementation of the system on the ground."
A spokeswoman for the two Huddersfield primary care trusts said: "We are working in partnership with our dentists to implement the new contract.
"We recognise that there are pressures in the introduction of any new working arrangements.
"But we are confident we can make the new contract a success."
Among the controversial proposals is forcing dentists to take a whole family as NHS patients or none of them.
Currently, many dentists treat under-18s on the NHS and offset the cost by treating their parents privately.
Charges for patients will also alter, with individual fees replaced by three bands of treatment. The lowest will be for a check-up, the second for any number of fillings and the highest for operations such as crowns and bridges.
Patients will only pay once, no matter how much work is done.
This has led to fears that people will wait until they need multiple treatments to save money.
ALMOST seven out of 10 dentists might quit the NHS when new Government reforms come into force, a survey says.
The survey of 120 dental practices for a national newspaper found that 44% have left the service in recent months, or sharply reduced their patient list, while another 24% are considering resigning.
The survey also brought criticism about the new system's overhaul of charges.