I've never heard of that and I have to see thats ridiculous. How can you be certified as a dental hygienist when you have never been to dental hygiene school? Especially after the first 2 years of dental school which is almost entirely books and minimal clinical activity. This is like saying an MD can be registered as a nurse after 2 years of med school.
During my BU interview (which happened eons ago) If I remember correctly I was told that you could work as a dental hygienist after the 3rd year of dental school. I think you still have to take the exam though.
it says that in order to get the certificate, all you need is a letter from the dean saying that you are qualified, and you also have to take their boards. So if anyone is reading this post and has some study material for me to study to the dental hygenist board, let me know!