Here are some frequently asked questions for international Applicants. Please see below for the relevant information.

We are afraid that the IDC is provided for the students from each one university of Indonesia, Vietnam, and Cambodia that have academic exchange agreements with us.
https://www.hiroshima-u.ac.jp/en/dent/international_exchange/International_Dental_Course

You have to take the two steps to enter the School of Dentistry.
First, there are two types of primary examinations : one is the General Entrance Examination, which is the same exam as Japanese students take, and the other is the Examination for Japanese University Admission for International Students (EJU), which is administrated only to the international students by Japan Student Services Organization (JASSO https://www.jasso.go.jp/en/index.html ).
After taking one of them, you need to take the exam which is administrated by School of Dentistry.
All the exams are conducted in Japanese, and applicants are required to have as adequate Japanese language abilities as ordinary Japanese students.
This is because liberal-arts educations and some specialized subects are offered in Japanese.
See the following websites for admission guide.
https://www.hiroshima-u.ac.jp/en/international/admissions/admission_guide
https://www.hiroshima-u.ac.jp/nyushi/yoko_doga/yoko (Japanese only)