| http://www.w3.org/ns/prov#value | - When you have a pain in your teeth, and it getting dark then it is a sign that you have to go for a root canal, it might be any kind of pulp in your tooth root which has to expelled of, and it is also possible that your teeth is dead inside so root canal is a process to connect teeth to the blood veins.source: When do you know if you need a root canal?
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