Question: a dentigerous cyst is, literally, a cyst on the tooth.
Answer: --> A dentigerous cyst is, literally, a cyst on the tooth.

Question: pb - the same principles as used for category 1 must be applied
Answer: --> Pb - The same principles as used for category 1 must be applied

Question: they work slowly, carefully, making sure each delenka had enough of the roots and at least one escape from the kidneys.
Answer:
--> They work slowly, carefully, making sure each delenka had enough of the roots and at least one escape from the kidneys.