Deciduous teeth first teeth seen in the mouth are the mandibular centrals and the last are the maxillary second molars. The primary teeth are made up of central incisors, lateral incisors, canines, first molars, and secondary molars; there is one in each quadrant, making a total of four of each tooth. All of these are gradually replaced with a permanent counterpart except for the primary first and second molars; they are replaced by premolars. The replacement of primary teeth begins around age six, when the permanent teeth start to appear in the mouth, resulting in mixed dentition. The erupting permanent teeth cause
Teeth (song) "Music Times" said Teddy Riley's work on "Teeth" was his only contribution to "The Fame Monster" and called the track the EP's "smallest". "Teeth" received a mixed reception from critics; some complimented the song and others called it the album's worst track. Gaga's vocals was compared to those of Christina Aguilera. "Slant Magazine" Sal Cinquemani said the song "sounds like something from Michael Jackson's last studio album as sung by Christina Aguilera ... that the closest she gets to another human being involves being tied up and bitten is revealing." Blogcritics' Clayton Perry said "Teeth", along with the tracks "Monster"