More than a quarter of people in the North East and north Cumbria struggle to get an appointment with an NHS dentist, new survey data suggests.
The British Dental Association said for millions accessing NHS dentistry "is just a nice idea rather that a reality they can depend on".
During the General Election campaign, Labour pledged to create 700,000 additional urgent dental appointments a year, as well as recruiting new dentists to under-served areas.
The NHS GP Patient Survey found 27 per cent of 23,570 respondents in the area covered by NHS North East and North Cumbria Integrated Care Board were unsuccessful when they tried to book an appointment with an NHS dentist in the last two years.
Of those, 9 per cent said no appointments were available, while 12 per cent were told the dentist wasn't taking any new patients.
Some NHS appointments are now available in Carlisle after months of patients having to travel to Hexham to access NHS services.
Louise Ansari, chief executive at Healthwatch England, said more fundamental reforms are needed, to give everyone a right to register with a local NHS dentist, in the same way as they can with a GP.
She said: "At the moment, dentists are not obliged to keep patients on permanently, which affects continuity of care, while the payment model for dentists does not incentivise them to offer fully preventative care to patients."
Across England, more than a quarter of people could not access an NHS dentist, which the British Dental Association said is around 5.6 million adults.
Areas with higher proportions of patients not being able to secure a dental check-up also saw higher levels of dissatisfaction with the services provided.
Of those who visited a dentist in the North East and north Cumbria in the last two years, 20 per cent found the experience to be fairly or very poor.
Eddie Crouch, chair of the BDA, said "many have simply given up trying", with the union also estimating 5.4 million people no longer attempt to make appointments, as they do not believe they can get one.
In the North East and north Cumbria, 20 per cent of 15,306 respondents who have not tried accessing dental care in the last two years said they had not think they could get an appointment.
A Department of Health and Social Care spokesperson said the lack of dentist access is "unacceptable".
They added: "There are large parts of the country where NHS dentistry barely exists anymore.
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"We will rebuild NHS dentistry, starting with an extra 700,000 emergency dentistry appointments. We will also reform the dental contract to encourage more dentists to offer NHS services to patients.
"Prevention is better than cure, so we will also introduce supervised tooth brushing for three to five-year-olds. These changes are fundamental to us building an NHS that is fit for the future."
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