That explains quite a lot about dentistry in USSR
But large chunks of it did become part of the USSR, as the article points out very clearly:
Zosia grew up fatherless in Vilnius, which between the wars belonged to Poland and was called Wilno. On 1 September 1939, she was just about to start her first year of medical school when Germany invaded Poland. Sixteen days later, the Soviet Union joined in, and quickly took Wilno, along with most of Poland’s east. A month later, the Soviets gave the city to Lithuania, which had coveted it since the end of the previous war.
Warsaw itself was in ruins. A great portion of the country’s doctors had been killed, and there was a desperate need for medical professionals of every kind. The intensity of this demand led to a certain loosening of standards in training. This relaxation was even more pronounced in the sister discipline of dentistry. Instead of going to years of medical school, all Zosia had to do to become a dentist was endure a short practicum and pass a test. The test was a set essay, on the “role of the mouth in the beauty of the face”.The snippet at the end does touch on Soviet dentistry directly, however.
One could read the story as "people had to do what they had to in order to survive and help their fellow humans". But no, you choose to focus on "Soviet dentistry hurrr" without knowing a thing about it.
The article is also guilty. It talks at length about this book with a story of horrible torture that is entirely made up. Essentially that book is a collection of every stereotype and conspiracy mashed into one. The modern-day equivalent would be a book about how QAnon and Pizzagate are real. But no, the author says "the book is a lie, but Russia is bad so it's justified", missing the obvious: the book is trash.