(a) In this section:
(1) “Controlled substance,” “opiate,” and “prescribe” have the meanings assigned by Section 481.002, Health and Safety Code.
(2) “National holiday” means a day described by Section 662.003(a), Government Code.
(b) The State Board of Dental Examiners by rule shall establish limits on the quantity of a controlled substance, including an opiate, that a dentist may prescribe to a patient as a teledentistry dental service. Except as provided by Subsection (c), the rules may not authorize a dentist to prescribe more than is necessary to supply a patient for:
(1) if the prescription is for an opiate, a two-day period; or
(2) if the prescription is for a controlled substance other than an opiate, a five-day period.

(c) For each day in a period described by Subsection (b)(1) or (2) that is a Saturday, Sunday, or national holiday, the period is extended to include the next day that is not a Saturday, Sunday, or national holiday.
(d) Rules adopted under this section must comply with applicable federal laws and rules.