When you take out a normal loan, the repayment process will already be set up via how long you wish to take to pay off the loan. Whether its 5 years or 30 years, the bank will set up a monthly payment amount which includes interest for you.
Some loans allow you to pay more than the set amount scheduled each month, others do not. Ideally, you would want to pay off as much as possible in the shortest amount of time. With huge dental school loans, your min. monthly payments are probably going mostly to paying down the interest rather than the principle balance.
I highly doubt anyone pays $6000/month to their loans. The more realistic number is $2000-3000/month