(See also. Introduction: The dental patient) teeth, the teeth are divided into incisors canines premolars and molars, usually starting with the right 3. Molar in the upper jaw numbered (The determination of the teeth). The determination of the teeth The numbering shown is the most widely used in the United States. Each tooth has a crown and a root. The canines have the longest and most stable roots. The internal dental pulp contains blood and lymphatic vessels and nerves and is surrounded by the hard, but porous dentin, a very hard enamel layer that covers the tooth crown; it is sensitive to touch and temperature changes. The bone-like cement is above the root, which when healthy is covered by gum (cross section of a canine). The first of a total of 20 primary teeth usually appear around the age of 6 months, with 30 months should all milk teeth erupted (see table: Times of tooth eruption). They are followed by 32 permanent teeth begin to appear about from the age of 6 years. The period of 6 to 11 years is called a mixed dentition phase in which both milk and permanent teeth are present. The timing of tooth eruption is an indicator of the skeletal age and can show growth retardation or even used to determine the age for forensic purposes. Cross-section of a canine supporting tissue The gingiva surrounding the teeth at the base of its crown. The alveolar processes consist of trabecular bone and contain pockets for the teeth. The periodontium consists of the tissues that support the teeth – gingiva, epithelial attachment, connective tissue attachment, periodontal ligament and alveolar bone. Mandible and maxilla bear the alveolar processes and accommodate the teeth. moistened saliva from the salivary glands and protects the teeth. The tongue directs the food between the occlusal surfaces milled and helps to clean the teeth. The upper jaw receives its innervation from the maxillary nerve, the second branch of the trigeminal nerve (fifth cranial nerve). The mandibular nerve, third and unterster branch of the trigeminal nerve, innervating the lower jaw. In the elderly or in some periodontal disease, a gingival recession puts the adjacent to the crown root freely and often provides a root caries. When a tooth is destroyed, the mechanical stimulation is lost, which is necessary for maintaining bone integrity. Consequently, the atrophy of the alveolar ridge begins (senile atrophy) when teeth are missing. Gum illustration provided by Jonathan A. Ship, D.M.D. var model = {thumbnailUrl: ‘/-/media/manual/professional/images/gingival_recession_orig_de.jpg?la=de&thn=0&mw=350’ imageUrl: ‘/-/media/manual/professional/images/gingival_recession_orig_de.jpg?la = en & thn = 0 ‘, title:’ gum disease ‘, description:’ u003Ca id = “v37894027 ” class = “”anchor “” u003e u003c / a u003e u003cdiv class = “”para “” u003e u003cp u003eZahnfleischschwund sets the root surfaces free u003c / p u003e u003c / div u003e. ‘credits’ figure provided by Jonathan A. ship

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