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Teeth and Hand Dominance

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In life sometimes there are things that on the surface may not seem to go together or have any apparent connection, but if you dig a bit deeper you’ll see just how connected they truly are. Whether it’s an odd food pairing, etc there are connections that exist that go beyond our basic comprehension, such as the relationship between teeth and hand dominance.

“Roughly 90% of humans are right-handed and this is one of the traits that separates us from most other primates who don’t really show any overall preference for left or right handedness. It’s believed that handedness played an important role in human evolution, with a recent study on the earliest evidence of right-handedness in the fossil record shedding light on when and why this trait arose. Interestingly, the clues were found not in our ancient hands, but in our ancient teeth. So why use teeth to investigate handedness? The answer lies in the scarcity of matching left and right arm bones in the fossil record, particularly those belonging to our earliest ancestors. Without matching left and right sets, it is impossible to examine differences in size and shape to determine which hand an individual favoured when completing manual tasks. Teeth, on the other hand, tend to survive relatively well in the fossil record and can preserve scratches, or “striations”, that establish handedness. Interestingly, nearly half of all striations were right-slanting. Right-slanting striations were particularly dominant on four of the front teeth (left and right central incisors, right second incisor and right canine).This led the authors to argue that most marks were made with the individual’s right hand. They also suggested that the four front teeth with many right-slanting striations were the focus of most processing activities.”

In order to better understand why things exist the way they do, it’s sometimes necessary to look back and examine. Whether you’re right or left handed maintaining the well being of your teeth is important! Make sure to regularly brush, floss and rinse and see your Aylmer dental professional for checkups and cleanings.

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