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Does an abscessed tooth need a root canal or dental filling?
It really depends. In the very least an abscessed tooth means bacteria has gone deep into the pulp of the tooth and has caused an infection so a dental filling will not fix the problem. There could also be other causes such as a fracture or even an infection within the gums.
You need to consult a dentist right away. For this scenario your teeth should get root canal treatment and a dental crown. This helps you get relief from abscessed tooth.