český lid otvírá ústa

anglicky: lid - people, populace; ústa - mouth; otvírat - to open

Once more, you see the general tendency of any political ideology to treat human beings as one homogeneous entity with the same needs and demands [hence the singular lid - people in Czech]; opening mouths for a dentist is connected with the more figurative expression "otevřít někomu ústa" = make someone speak.