Some 15% of dentists have put up their prices so much since they were allowed to set their own fees that charges for some treatment has doubled, Nos television reports on Thursday.

The broadcaster says a majority of MPs would now like to see a blacklist set up for dentists who have put their charges up too much.
Dentists, orthodontists and mouth hygienists have been free to decide their own fees since the beginning of the year. Health minister Edith Schippers hopes the three-year experiment will bring prices down, increase competition and boost quality.
Nos compared the prices of 250 dentists and found some charged 2.5 times as much as others for the same treatment.
Meanwhile, the AD reports that dentists and orthodontists are at odds with insurance companies about the new fees. The dentists say patients are having to pay more for their treatment because insurance companies have reduced the level of dental insurance cover.