yes that is what i found in their website
Since I am a foreign graduate, what do I need to do to be eligible for the WREB exam?
You will need to contact the state board where you wish to practice dentistry and inform that state board that you are a foreign graduate and want to take the WREB dental exam. The state board will send an original letter (with the state seal affixed) to the WREB office stating that you have met their requirements and are eligible to take the WREB dental exam. This letter is your proof of qualification. You may register for an exam before the letter from the state board is received. The letter must be received three weeks prior to the first day of the exam, or you will be cancelled from the exam and no refund will be given. You will not receive your candidate schedule until the original copy of the qualifying letter is received from the state board
but still don't know how can you get the State board to send letter to WREB mentioning that you can take the exam