“They're not full-size teeth: Some people call them microdonts, or denticles, or toothlets,” says Sidney Eisig, a professor at Columbia University’s dental school. 

That's an issue with implications both ethical and scientific, says anthropologist and bioethicist Sandra Soo-Jin Lee. She heads up CUIMC's new Division of Ethics

After an IUI, you can do nearly everything you used to do with two exceptions, said Dr. Paula C. Brady, M.D., a reproductive endocrinologist and infertility specialist at CUIMC.

“This study shows that the young adult stage is a window of opportunity for early prevention,” said the lead author, Yiyi Zhang, a research scientist at Columbia University.