# The National Health Service (Dental Charges) Regulations 1988, Paragraph 2


Then £x shall be compared with the full amount of the charges payable to the dental practitioner by the patient in respect of the course of treatment (“£y”) and—
(a) if £x equals or exceeds £y, there is no charge for the supply of the appliance;
(b) if £x is less than £y, the charge for the supply of the appliance is—
(i) £y minus £x, or
(ii) the amount specified in relation to the appliance in column (2) of Part I of Schedule 1,
whichever is the lesser amount.

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Source: https://www.legislation.gov.uk/uksi/1988/473/schedule/2/paragraph/2 (the official version)
Page: https://openlegislation.uk/national-health-service-dental-charges-regulations-1988/schedule-2/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.