The police department says a team of senior investigators in the Criminal Investigation Division reviewed the material allegedly posted by male classmates of the women on a now deactivated Facebook page.
The department says it will not proceed with a criminal investigation.
Dalhousie had initially refused a police request to provide the postings based on student privacy concerns, but then indicated it would co-operate.
Reports of the offensive posts and the university's initial response prompted rallies and calls for the expulsion of the 13 students.
The fourth-year students who were part of the Facebook group have been ordered to attend classes remotely and are suspended from clinical duties, which could affect their ability to graduate.
The Facebook page at the centre of the controversy has been taken down.
But according to the CBC, members of the Class of DDS Gentlemen page on Facebook voted on which woman they'd like to have "hate" sex with and joked about using chloroform on women. The CBC said in another post, a woman is shown in a bikini with a caption that says, "Bang until stress is relieved or unconscious (girl)."
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