Root canal treatment is dental procedure that removes infected pulp, eliminates bacteria, and saves a tooth that might otherwise need extraction. Thanks to modern anaesthetic techniques and advances in endodontic treatment, especially rotary endodontics, root canals are now more comfortable and efficient than ever.
But, how can you tell if you need a root canal?
Your body sends warning signals when a tooth becomes inflamed or infected. However, no size fits all when it comes to tooth infections. Tooth infection can present with a wide range of signs and symptoms, indicating the need for a root canal treatment.
Because the signs and symptoms can vary greatly, only a dentist can make a definitive diagnosis through a review of your dental history, a thorough examination, and dental radiographs.
How Do You Know If You Need a Root Canal? 8 Signs You Shouldn’t Ignore
A tooth requires root canal treatment when the dental pulp suffers an irreversible damage due to deep decay, trauma, or infection.
The dental pulp, located at the centre of the tooth, contains a rich network of nerves and blood vessels. It supplies nutrients to the tooth and acts as an early warning system by detecting potential threats, often in the form of pain or sensitivity.
The symptoms you experience may vary depending on whether the infection:
- Extends to dentin or pulp
- Is confined within the tooth
- Is acute or chronic
- Has resulted in death of the pulp tissue (necrosis)
By the time you finish reading this blog, you’ll know the key signs and symptoms you shouldn’t overlook, as they could mean you need a root canal treatment.
Read more: 7 Essential Root Canal Aftercare Tips for Faster Healing
1. A Cavity (Tooth Decay)
Case 1: The second molar shows signs of tooth decay. The patient complains of a severe pain in the tooth that relieves with pain medication. The tooth doesn’t appear severely damaged, the persistent pain may suggest the need for a root canal treatment.
Peculiar features of a cavity
Tooth decay is the most common reason a tooth requires root canal treatment. When left untreated, a cavity can progress deeper into the tooth and eventually reach the pulp.
A cavity may appear as:
- A visible hole in the tooth
- Dark staining in the pits and fissures of molars
- Black or brown discolouration on the side of a tooth
- An enamel crack or fracture
Read more: Cavities: Causes, Symptoms, Prevention, and Treatment
2. Cracked or Fractured Teeth
A crack or fracture in the enamel can create a pathway for bacteria to enter the tooth. Under normal circumstances, enamel acts as a protective shield for the inner layers of the tooth. When this protection is compromised, the risk of infection increases significantly.
Many enamel cracks are extremely small and may not be visible to the naked eye. Dentists often use specialised lighting, magnification, or imaging techniques to detect them.
Common symptoms of a cracked tooth include:
- Pain when biting down
- Sensitivity to hot or cold foods and drinks
- Sharp, intermittent tooth pain
What Causes Tooth Cracks and Fractures?
Teeth exposed to excessive or uneven (eccentric) biting forces over time are more likely to develop cracks. Common causes include:
- Teeth grinding (bruxism)
- Chewing ice
- Biting or chewing hard objects such as bones
- Cracking nuts with your teeth
3. Severe, persistent Toothache
Persistent tooth pain is one of the most common signs that a tooth may require root canal treatment.
You may experience:
- Spontaneous, throbbing tooth pain
- Severe pain that persists for hours and is relieved by pain medication
- Pain triggered by hot, sweet, or acidic foods
- Pain that worsens at night or when lying down
- Pain in a previously filled tooth
- Pain radiating towards face, ear or jaws
You may experience one or more of the symptoms listed above. The type and severity of pain can vary depending on the extent of pulpal damage and the spread of the infection.
Key message: Although dental treatment can be expensive, tooth pain should never be ignored. Delaying treatment may allow the infection to progress, leading to greater complications, more complex and costly treatment, and, in severe cases, the loss of the affected tooth.
Read more: Pit and Fissure Cavities or Stains: Understanding Key Differences
4. A Painless, Discoloured tooth
Case 2: Internal bleeding in the upper front tooth (central incisor). The release of oxidized hemoglobin from the blood has turned the tooth grey. Internal bleeding of this sort often occurs after traumatic injury to the tooth.
Peculiar features of a painless, discoloured tooth
It might sound weird, but a tooth does not have to be painful to be unhealthy.
A tooth that gradually turns grey or dark may have undergone pulp necrosis, which means the pulp tissue inside the tooth has died.
Pulp necrosis can occur as a result of:
- Dental trauma, such as a sporting injury or accident
- Irreversible pulp damage
Over time, the breakdown of blood products within the tooth can cause the dentine to darken, giving the tooth a greyish appearance.
Do Dead Teeth Need Treatment If They Don’t Cause Pain?
Yes, a dead or infected tooth requires prompt treatment.
Although the tooth may not hurt, a dead tooth can harbour millions of bacteria and release toxins into the surrounding tissues. If left untreated, the infection can spread to the jawbone and gums, leading to more serious health concerns.
Here’s how other organs get involved;
Microorganisms and their toxins can escape from infected pulp chamber and trigger a low-grade chronic infection around the tooth. In some cases, these bacteria may enter the bloodstream through the tissues surrounding the tooth (gums) and travel to distant parts of the body, potentially contributing to inflammation in other organ systems
Several studies have suggested a possible link between chronic dental infections and systemic conditions such as rheumatoid arthritis.
According to the focal infection theory proposed by Rosenow, enclosed bacterial reservoirs, such as infected root canals and areas of chronic dental infection, may serve as sources of bacteria and inflammatory mediators that can enter the bloodstream.
A study published in International Endodontic Journal found that many patients diagnosed with rheumatoid arthritis had one or more teeth with necrotic (dead) pulp tissue. Also, similar bacterial species from both the infected teeth and the inflamed joint tissues were isolated from these patients, suggesting a potential connection between oral health and joint health.
Additional Disinfection for dead infected teeth
Dead teeth are often heavily contaminated with bacteria, making them more challenging to disinfect completely during root canal treatment. In such cases, an additional appointment may be required to eliminate bacterial biofilms from the root canal system.
During the appointment, after cleaning the root canals your dentist may place an antibacterial dressing inside the tooth and temporarily seal it. This medication is typically left in place for 2 to 7 days to help eliminate any remaining bacteria before the final filling is placed.
Read more: Does Pregnancy Damage Your Teeth? The Truth About Pregnancy, Cavities, and Gum Disease
5. Lingering Sensitivity to Hot Foods and Drinks
Occasional sensitivity is common, but prolonged sensitivity that lingers after the trigger is removed may indicate irreversible damage to the dental pulp.
For example, if you drink a hot cup of coffee and the discomfort continues for more than a few minutes afterwards, the nerve inside the tooth may be inflamed beyond its ability to heal.
Lingering sensitivity is often an early warning sign that root canal treatment may be needed to save the tooth and prevent the infection from worsening.
6. Dental Abscess or Gum Boil
Case 3: An 18 year old boy has developed a tooth abscess above and between the canine and first premolar.
Peculiar features of a dental abscess or gum boil
Swelling of the gums, face, or jaw may be a sign of an infected tooth. At this stage, the infection is no longer confined to the tooth and has spread to the surrounding tissues.
A dental abscess develops when bacteria from an infected tooth accumulate and form a pocket of pus apical to root apex (end) of the infected tooth.
This may cause significant discomfort and may require urgent dental treatment.
Common symptoms include:
- Throbbing toothache
- A gum boil or pimple on the gums
- Swelling of the gums, face, or jaw
- Difficulty chewing or eating
- Tenderness around the affected tooth
- An unpleasant taste or discharge in the mouth
Prompt treatment can help relieve pain, control the infection, and save the affected tooth.
Case 4: A swelling has developed below the crown of severely decayed first molar.
Key message: Dental infection should never be taken lightly. Untreated tooth infection may spread into deeper facial and neck spaces and can block the airway, leading to life threatening complications.
7. A Pink Tooth
A pink tooth is a rare finding and accounts for only a small percentage (1%) of teeth requiring root canal treatment. It may be a sign of internal resorption, a condition in which the tooth structure is gradually destroyed from within.
Internal resorption is often associated with a previous history of dental trauma. Following injury, specialised cells called odontoclasts become activated and begin resorbing the dentine from the inside of the tooth. As the dentine layer thins, the rich blood supply of the dental pulp becomes visible through the enamel, giving the tooth a characteristic pink hue.
8. Pink Growth from the Cavity
Occasionally, deep open cavities that extend into the pulp may develop an overgrowth of pink, fleshy (hyperplastic) tissue. This tissue grows as the body’s natural attempt to protect the exposed pulp from the oral environment.
Known as a pulp polyp (or chronic hyperplastic pulpitis), this condition is most commonly seen in teenagers and young adults because their pulp tissue is larger and has a richer blood supply. Although it may appear harmless, deep cavity typically requires root canal treatment to eliminate the infection and preserve the tooth.
Final Thoughts: How can you tell if you need a root canal?
Root canal treatment is one of the most effective ways to save a tooth with deep decay or infection.
Understanding the different signs and symptoms that indicate a tooth may need a root canal can help you seek treatment early, save your tooth, and prevent further complications.
The sooner you seek treatment, the better the outcome and the greater long-term survival of your tooth.