1. Open your mouth slightly so that your teeth are apart and your lips are separated.
2. Round your tongue slightly, and raise the sides of your tongue so that they are against the upper molars.
3. Raise the front of the tongue so that it points to the area just behind the gum ridge.
4. Keep the sides of the tongue up and start the breath stream flowing. Force the air against the front teeth, but make sure to keep the front of the tongue elevated.