Should your teeth touch when resting?
Resting teeth means they are sitting dormant and it also means they're not interacting with anything else like food, your tongue, or each other. The standard resting position has the teeth not touching each other; when the mouth is closed the teeth are slightly apart.
Should all my teeth touch?
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.