How many marks do you need in university to bacome a dentist?

"Marks"? Confused. In the ordinary course of things, one must have (at least) an associates' degree --- preferably (today) a bachelor's degree. The disciplines must include organic/inorganic chemistry; at least 101 + 102 physics; Biology 101 + 102, preferably in vertebrate/invertebrate biology; cell (biocellular dynamics); math through calculus; and have studied the "core ciriculum", as in English, humanities, social science, etc. The point being, that it is just as difficult to get into Dental school, today, as it is to get into Medical school. So do your homework and get your degree.