Persistent bad breath or a foul taste in the mouth despite brushing and flossing can be a symptom of a bacterial infection.
Darkening of the tooth
Infection within the tooth’s root canal can result in tooth discoloration. Dead tissues within the tooth tend to change to a dark brown, grey, or yellow color which can show through the dental enamel.
The presence of red, swollen, and tender gums particularly near the tooth that had a root canal may be a sign that an infection is present.
What causes infection after a root canal?
Root canal procedures are a common safe and effective procedure to repair teeth and restore oral health. The total success rate of root canal therapy on average ranges from 86% to 98%, as reported by a study published in the European Journal of Dentistry. Some individuals however may experience infection even after a successful root canal procedure. According to the American Association of Endodontists (AAE), some factors may play a role in this reinfection process, such as:
- Sometimes small or curved shaped canals can be missed during treatment which may allow bacteria to remain inside the tooth and cause infection.
- If bacteria are able to access the root canal before the permanent restoration or filling is placed, the canal may become reinfected. A prolonged delay in placing the permanent restoration can also increase the risk of reinfection.
- A lack of proper oral hygiene can create new cavities and reintroduce bacteria to the affected tooth.
- A crack or opening in the filling or restoration of the tooth that had the root canal performed could reintroduce bacteria into the root canal.
If you are experiencing any signs or symptoms of reinfection, you should contact a dentist immediately. The sooner action is taken to combat the infection, the more likely treatment will be successful.