ASAP , well before the deadline. Allow at least a week after you request your file to be sent before it actually goes out. Other supplementary materials . A few require a high school transcript. All of this information you will send directly to each school which requests it.
Most dental schools require a personal interview.
You will receive an invitation to visit the school and interview with the admissions committee members. As was mentioned above, your predental committee interview is good preparation. Your interview performance is critical to your success. Interviews generally take place anywhere from September through January depending on when you submit your application. If the school does not require an interview, you may still make an informal visit.