The upper teeth cover the lower teeth clinically refers to the maxillary relationship, depending on the degree of cover, not more than the incisal end of 1/3 is normal, if more than may be deep maxillary. Under normal circumstances, the upper teeth cover the lower teeth, if the lower teeth cover the upper teeth, it is antimandibular. Normal overjet: The maxillary front teeth cover the labial surface of the mandibular front teeth not more than 1/3 of the incisal surface, and the incisal edge of the mandibular front teeth bites the lingual surface of the maxillary front teeth within the incisal surface of the maxillary front teeth within the incisal surface of the maxillary front teeth. Deep overjet: If the maxillary anterior teeth cover more than 1/3 of the labial surface of the mandibular anterior teeth or the incisal edge of the mandibular anterior teeth bites more than 1/3 of the lingual surface of the maxillary anterior teeth, it is called deep overjet. Whether the upper teeth cover the lower teeth is normal or not, you need to go to the hospital to improve the examination, specific advice to consult a professional doctor.