You may not have realized this, but teeth are not meant to touch. It sounds odd, but think about it. They don't touch while you speak, smile or rest. Even when you chew, your teeth only have to be close enough to mash food, not necessarily touch.

What teeth should touch when you bite down?

When we say bite, what we're talking about is the way your upper and lower jaw come together. Your upper teeth should fit slightly over your lower teeth and the points of your molars should fit the grooves of the opposite molar. If your jaw lines up like this, you most likely have a healthy bite.

Should all teeth touch when biting?

From this view, all of the teeth should be aligned in a flowing curve shaped like the famous St. Louis Arch. They should all be touching each other with no overlapping or spacing between them. The upper arch is harder for patients to see, but it should also be well aligned with no spaces or overlapping.