“Do I need a root canal?” is the question that brings most people to the dentist’s chair already braced for bad news. Jordan wrote this for readers who want to understand the symptoms and the diagnostic logic before they’re sitting in front of someone telling them.
The classic symptoms that suggest pulp involvement
- Lingering pain after hot or cold stimulus. Normal sensitivity passes within seconds. Pulp inflammation makes the pain linger 30 seconds, a minute, sometimes longer.
- Spontaneous throbbing — pain that wakes you up at night, or starts without an obvious trigger.
- Pain on biting on a specific tooth, particularly if it persists after a few days.
- Swelling around the gum or face near a specific tooth.
- A small “pimple” on the gum near a tooth root — this is a sinus tract draining infection from an abscess.
- Tooth discolouration — particularly a single tooth turning grey, brown or yellow when its neighbours haven’t.
- Bad taste in the mouth coming from a specific area, especially if it tastes like pus.
Symptoms that suggest something else
- Brief sensitivity to cold that passes immediately — usually exposed dentine or recession, not pulp.
- Sensitivity that resolves after a few weeks of sensitive-teeth toothpaste — also recession or hairline cracks, not usually pulp.
- Pain across multiple teeth on one side — often sinus-related (especially if you’ve had a recent cold or seasonal allergies).
- Generalised gum pain — likely periodontal, not pulpal.
- Jaw pain that’s worse in the morning — bruxism (clenching/grinding), not a tooth-pulp issue.
The diagnostic tests your dentist will use
- Cold test — a cotton pellet with refrigerant spray held against each suspect tooth. Lingering or absent response is diagnostic.
- Electric pulp test — small electrical stimulus to confirm whether the nerve is alive or non-vital.
- Percussion test — tapping on each tooth. A tooth that’s sensitive to percussion suggests inflammation around the root tip.
- Periapical x-ray — looks for darkening at the root tip (a sign of established infection).
- CBCT 3D scan — for complex cases or where conventional x-ray is inconclusive.
The decision tree
- Pulp is healthy: conservative restoration (filling, crown) — no root canal needed.
- Pulp is inflamed but reversible (sharp pain that doesn’t linger): often a “watch and review” approach with a sedative dressing.
- Pulp is irreversibly inflamed (lingering pain, spontaneous pain): root canal or extraction.
- Pulp is necrotic (already dead, often with abscess): root canal or extraction.
The “should I just have it out?” question
Extraction is the only alternative to a root canal. It looks cheaper short-term ($300–$500 for a simple extraction vs $1,500–$2,800 for an RCT plus crown) — but the gap then needs to be replaced with an implant ($4,500–$6,500), bridge ($4,000–$6,000) or denture ($800–$1,800), or left to cause bite drift.
Saving the natural tooth is almost always the better long-term call.
