# The National Health Service (Dental Charges) Regulations 1989, Paragraph 2


Then £a shall be compared with the full amount of the charges payable to the dental practitioner by the patient in respect of services provided under the contract or arrangement (“£b”) and–
(a) if £a equals or exceeds £b, there is no charge for the supply of the appliance;
(b) if £a is less than £b, the charge for the supply of the appliance is–
(i) £b minus £a, or
(ii) 75% of the Statement remuneration for the supply of the appliance,
whichever is the lesser amount.

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Source: https://www.legislation.gov.uk/uksi/1989/394/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/national-health-service-dental-charges-regulations-1989/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.