Jonathan Lajoie (I) Jonathan Lajoie was born in 1980 in Montreal, QuÃ©bec, Canada. He is an actor, known for The League (2009), Let's Be Cops (2014) and Show Me Your Genitals (2008).
The tooth numbering continues by assigning teeth numbers descending to the lower left third molar (number 17) and follows the lower (mandibular) jaw up to the tooth farthest back on the bottom right side of the mouth (number 32).
In humans, there are usually 20 primary (baby) teeth and 28 to 32 permanent teeth, the last four being third molars or  wisdom teeth , each of which may or may not grow in. Among primary teeth, 10 usually are found in the maxilla (upper jaw) and the other 10 in the mandible (lower jaw).ndeed, teeth appear to have first evolved in sharks, and are not found in the more primitive jawless fish-while lampreys do have tooth-like structures on the tongue, these are in fact, composed of keratin, not of dentine or enamel, and bear no relationship to true teeth.