"The main technique for mewing is to have your lips closed with your front bottom teeth just behind the back of your front upper teeth, without them touching," Jones explains. "Next, use your tongue to cover the entire upper palate of your mouth.

Which teeth should touch first?

So how, optimally, should our teeth align? FROM THE FRONT: your upper front teeth should fall in front of your lower teeth (toward your lip), and should overlap them by about 2 mm. Upper and lower front teeth should hit lightly.

Should your teeth touch when you talk?

No your front teeth (or any of your teeth) should not touch when you are speaking. We use out teeth to help form the sounds required for clear speech. This means your teeth and your tongue will touch very frequently while you're speaking, however your teeth should never be touching.