The record is valid for a month and it is not possible to register. I called in the morning on the specified day, two months in a row, they told me that there were no coupons and if I didn't like something, I should enroll in any other paid clinic.
Good dentistry, although it is not always possible to get a ticket quickly... I especially want to express my gratitude to Yelets Alina Nikolaevna and Bubek Artyom Yuryevich, real professionals in their field