Whistling is a skill that can be tricky to master at first, especially if you're trying to achieve one of those loud whistles often used to call kids or pets in from outdoors. But once you get the hang of it, you'll be able to do it without even thinking. There are several reasons why you might want to learn to whistle without using your fingers, especially if you work in situations where your hands might not be clean. Fortunately, you only need your mouth--and the right technique--to make the desired sound.
Take a sip of water before you begin. Wet lips create a better whistling sound.
Curl your lips over your top and bottom teeth.
Relax your tongue so that it is lying flat in your mouth, just touching the back of your bottom lip that is stretched over your bottom teeth.
Inhale until you notice your chest rise. Keep your lips slightly open.
Extend your lower jaw and pull your curled lips out toward your ears. Then, blow out the air from your lungs.
If this does not create the whistle you want, you can experiment with moving your tongue into different positions and aiming your exhale higher or lower in your mouth as you blow out.