|(a) Medical check-ups eligibility. Clients are eligible to receive THSteps medical check-ups and services from birth through the end of the month of their 21st birthday. (b) Dental Services Eligibility. Clients are eligible to receive THSteps dental check-ups beginning at six months of age or at the first eruption of primary teeth, whichever occurs first, through the end of the month of their 21st birthday. Clients are eligible for any medically necessary dental services from their date of birth. As described in the TMPPM, eligibility for certain dental services may require prior authorization, and for some services, clients lose eligibility on their 21st birthday. A specific exception applies to orthodontic services, as described in §33.71(c) of this title (relating to Orthodontic Services and Prior Authorization).