Direct bite is very similar to physiological, so it is difficult to distinguish. However, there are differences. The teeth in direct occlusion are in contact with each other by cutting edges. And normally should go for each other.
Doctors sometimes say that this is absolutely normal. Although it is not. The fact is that the contacting cutting surfaces further lead to the pathological abrasion of teeth. Over time, the teeth begin to wear down.
This leads to a change in the joints, and then there may be limitations in opening the mouth. Such a bite necessarily requires appropriate treatment. And the treatment lies in the fact that special silicone mouthguards are placed on the cutting interacting surfaces of the teeth.