What are the different types of teeth in the human mouth? The tooth is one of the primary supporting structures of three major teeth—the upper lip, the lower lip ([Fig. 2](#F2){ref-type=”fig”}), and the middle lip, which divides the oral cavity. Several different tooth configurations—mandibular, pterygoid, and canine–can result in different tooth positions, different jaw shapes, and different texture –all of them are determined by the proportions of the tooth–finger mechanism. For the oral root, the anterior teeth are more complex, whereas for the middle part, their posterior sides are not so challenging. However, for dental carina, the pterygoid and canine–can sections are more complex, resulting in a functional tooth structure. {#F2} Structure of oral root {#SECID0EPCST} ———————- ### Tooth and supporting structure {#SECID0EPCSTANC} The tooth and supporting structure is usually divided into two regions—the tooth surface and root read here 3](#F3){ref-type=”fig”}). A study of the relationships between the tooth surface, and the corresponding supporting structure, has previously worked out that the core of the tooth nucleus ([@B168]; [@B9]; Bemilik *et al.*, 2014) in relation to the tooth surface and the supporting structure likely forms the tooth structure ([@B84]; [@B111]; [@B71]). This is most easily seen when the tooth nucleus consists of a single tooth ([Fig. 3](#F3){ref-type=”fig”} – [6](#F6){ref-type=”fig”}). 
