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Oral Anatomy
 
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The Teeth
    This is probably the most important entity inside the mouth. The tooth plays a major role in the most vital process needed in every living specie in order to survive, eating. I human specie in particular, the whole process of digestion actually starts inside the mouth. Food is chewed and mixed with saliva before it has to be brought down to the stomach for further processing.
best to learn the nomenclature, or the system of names of each tooth. The first molars are the first set of teeth in the permanent dentition to emerge in the oral cavity. They appear at the age of 6 years, hence these teeth are oftentimes called "the 6 year molar." The last to emerge are the 3rd molars. These teeth don't come out until the age of 17 years or even later. Third molars are always subjected to variations and anomalies.
The Permanent Set of Dentition
    Aside from function, the tooth also plays a vital role in aesthetics. A beautiful set of teeth emanates a beautiful smile. 
    Studying the tooth alone is a broad subject to tackle. In order to understand fully this subject, it is 
     A lot of factors contributed to these anomalies and variations. 
There are a total of 32 permanent teeth, including third molars when present. A total of 16 teeth comprise each arch, (upper and lower).
Below is a table showing the sequence of eruption of the permanent set:
Tooth
(Maxillary)
Root Length
(mm.)
Crown Length (mm.)
Eruption 
(in years)
Central Incisors
13 
10.5
7-8
Lateral Incisors
13
9.0
8-9
Canines
17
10.0
11-12
First Premolars
14
8.5
10-11
Second Premolars
14
8.5
10-12
First Molars
*b=12     *l=13
7.5
6-7
Second Molars
*b=11     *l=12
7.0
12-13
Third Molars
11
6.5
17-21
 
Tooth
(Mandibular)
Root Length
(mm.)
Crown Length (mm.)
Eruption 
(in years)
Central Incisors
12.5 
9.0
6-7
Lateral Incisors
14
9.5
7-8
Canines
16
11.0
9-10
First Premolars
14
8.5
10-12
Second Premolars
14.5
8.0
11-12
First Molars
14
7.5
6-7
Second Molars
13
7.0
11-13
Third Molars
11
7.0
17-21
Note: *b stands for buccal or toward the cheek; *l stands for lingual or towards the tongue or palate

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