New Jersey: I never understood why it is so expensive to sell a dental practice. 10% is a lot of money to pay a broker when dental practices sell for hundreds of thousands of dollars. While 3 Percent Dental charges 3.99% commission, they also charge 2.99% commission and 1.99% commission based on your volume. And they must sell your practice to receive their commission. It’s a brokerage firm that makes sense and is fair and honest.