According to a study published in the April issue of the Journal of the American Dental Association- April.2013. Researchers from Tufts University School of Dental Medicine have found that children who received dental anesthesia in their gums between the ages of two and six were more likely not to develop wisdom teeth as they grow up.
Dental records of 220 children who had received dental anesthesia between the ages of two and six and who also had a dental X-ray taken three or more years after their first treatment at the clinic were analyzed. The researchers found that those who had received local dental anesthesia (numbing) in the lower jaw were over four times more likely to have missing lower wisdom tooth buds than those who did not have the injection.
Normally, Wisdom tooth buds, which are very small with nearly same diameter as that of the injection needle, begin to develop between the ages of 2 and 6. Dental anesthesia is generally given close to the wisdom tooth. Although this study showed a link between dental numbing and an interruption in wisdom tooth development, it didn't prove a cause and effect relationship. Moreover the study is limited by small data, there's further need to larger sample sizes and longer periods of observation for better understanding and explanation.
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