The teeth have nothing to do with a transverse flute embouchure. I suggest putting your lips together and blowing and letting the airstream make the opening. Blow fast, cold air against your index finger while looking in a mirror. While blowing this fast, cold stream of air bring the flute up to your lips and let the bottom lip cover 1/3 of the opening trying to direct the airstream so that it is cut in half by the edge of the "embouchure hole". The temptation will be to make a larger opening in the lips to get a sound. Don't do it! Keep the opening small and adjust the position of the flute and the head until the air hits its mark. When it does you will be rewarded with a clear, full tone.