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  • <p>In cases where root canal treatment has been unsuccessful, debris seeping from the tooth will irritate the tissues that surround its root.</p><p>This doesn't always create symptoms that the patient notices.</p>
     

    In cases where root canal treatment has been unsuccessful, debris seeping from the tooth will irritate the tissues that surround its root.

    This doesn't always create symptoms that the patient notices.

  • <p>One response to this insult is a loss of density of the surrounding bone. On an x-ray, this loss shows up as a dark spot (a "radiolucency").</p><p>If the tooth has been asymptomatic, this x-ray evidence may be the only hint that the tooth requires further treatment.</p>
     

    One response to this insult is a loss of density of the surrounding bone. On an x-ray, this loss shows up as a dark spot (a "radiolucency").

    If the tooth has been asymptomatic, this x-ray evidence may be the only hint that the tooth requires further treatment.

  • <p>Another symptom that may be overlooked by a patient, but noticed by their dentist during a routine exam, is the formation of a "fistulous tract."</p><p>On inspection, these lesions look like small pimples.</p>
     

    Another symptom that may be overlooked by a patient, but noticed by their dentist during a routine exam, is the formation of a "fistulous tract."

    On inspection, these lesions look like small pimples.

  • <p>A fistulous tract functions as a drain for the pus coming from a tooth infection. And its formation may be the reason why the tooth doesn't cause pain or swelling.</p><p>Rather than building up (an event that would cause symptoms), the pus coming from the infection is able to vent off.</p>
     

    A fistulous tract functions as a drain for the pus coming from a tooth infection. And its formation may be the reason why the tooth doesn't cause pain or swelling.

    Rather than building up (an event that would cause symptoms), the pus coming from the infection is able to vent off.