Five Signs a Tooth Needs a Root Canal (and What Happens If You Wait)

Dr. Shrey Suri · Gurugram · Updated 2026-08-23

A toothache that comes and goes can be easy to ignore, especially when it stops hurting for a day or two. But some tooth pain is a sign that the nerve inside the tooth is inflamed or infected, and that usually means a root canal is needed. Knowing the early warning signs can help you save the tooth before the problem gets bigger and more expensive to treat.

What is a root canal, in simple terms

Every tooth has a soft tissue core called the pulp, which contains nerves and blood vessels. When deep decay, a crack, or an old filling allows bacteria to reach this pulp, it becomes inflamed or infected. A root canal treatment removes this damaged tissue, cleans the inside of the tooth, and seals it, allowing you to keep your natural tooth instead of losing it.

Five signs your tooth may need a root canal

1. Lingering pain after hot or cold food

Mild sensitivity that fades in a few seconds is often normal. But if a sip of tea or ice cream causes a sharp ache that lingers for 30 seconds or more, it may mean the nerve inside the tooth is damaged.

2. Pain when chewing or biting down

Discomfort or a dull ache specifically when you chew, especially on one side, can point to inflammation at the root tip or a crack that has reached the nerve.

3. A pimple-like bump on the gum

A small, recurring bump near a tooth, sometimes with a bad taste when it drains, is usually a sign of infection at the root. This is called a sinus tract and it means pus is finding a way out through the gum.

4. Swelling in the gum or face

Visible swelling near a tooth, or puffiness in the cheek or jaw, suggests the infection has spread beyond the tooth itself. This can sometimes come with fever and needs prompt attention.

5. Tooth darkening or a dull ache that won't go away

A tooth that has turned slightly grey or dark yellow compared to its neighbours may have a dying nerve inside, even without obvious pain. A constant dull ache, especially one that wakes you up at night, is another red flag.

What happens if you wait

It is tempting to wait out a mild ache, especially if painkillers seem to help. But once the nerve is infected, it does not heal on its own. Here is what typically happens with delay:

• The infection spreads: Bacteria can travel to the bone around the root, causing an abscess.
• Swelling and pain worsen: What started as mild discomfort can turn into severe pain and facial swelling that may need urgent treatment.
• Bone loss around the root: Untreated infection can slowly eat away at the jawbone supporting the tooth, making future treatment harder.
• The tooth may become unsavable: If the infection and bone loss progress too far, extraction may become the only option instead of a root canal.
• Costs usually go up: Treating an advanced infection or replacing an extracted tooth is generally more involved and costlier than an early root canal.

Why early treatment matters

A root canal done early, before major swelling or bone loss, tends to be simpler, more predictable, and easier on your pocket than treatment delayed until the infection is advanced. Most root canal treated teeth also need a crown afterward to protect them from cracking, since the tooth structure is weaker after the nerve is removed.

If you are in Gurugram and noticing any of these signs, it is worth getting the tooth examined with an X-ray rather than waiting for the pain to become unbearable. An early check can often mean the difference between saving your natural tooth and losing it.

At Dr. Shrey Suri's clinic, patients are examined carefully before any treatment is recommended, and the plan is explained clearly so you know what to expect at each step.

Treatment costs mentioned on this page are indicative ranges for the Gurugram region. Your exact cost depends on your case and will be confirmed after a clinical examination at the clinic.