I just noticed that my two rows of teeth don't touch when I'm relaxed or just have my mouth closed (e.g. Looking at Netflix). Is that normal?
How do you mean?
It is normal for the anterior teeth of the lower jaw to lie behind the anterior teeth of the upper jaw.
The molars are on top of each other.
Or are you concerned with the basic tension?
When I sit relaxed, my teeth don't touch.
When I have closed my mouth the upper teeth and the lower teeth do not touch. Not the incisors and not the molars either. No
This is perfectly fine in relaxation.