We are referring to deep overbite when the vertical overlap of the teeth occurs. The lower front teeth bite too far up behind the upper front teeth into palate. The distance between the upper and lower arch is more than 1-1,5 mm. This phenomenon can easily be examined by you when looking in the mirror. There are different volumes of deep bite, but the bigger the distance the more serious the problem. So we need to look for solutions and the reasons are more anatomical than aesthetic.