Signs a Tooth Needs a Root Canal, Not Just a Filling
Pain alone doesn't settle the question. A small cavity can hurt, a badly damaged nerve may stop hurting. We look at the pattern. Does heat linger after the drink is gone? Does biting cause a sharp jolt? Those details help us separate surface decay from trouble inside the tooth. A filling can close decay, it can't heal infected pulp. That's the key difference.
- Hot or cold pain stays for 30 seconds or longer after contact ends.
- Biting or releasing pressure brings a sharp pain from one tooth.
- A small bump forms on the gum near the sore tooth.
- The tooth darkens after an old injury, even without strong pain.
- Swelling appears around the tooth or begins spreading into the face.
Not sure whether your pain counts as lingering? That's common. None of these signs proves you need a root canal. A cracked tooth, gum irritation, or a high filling can feel similar. And some infected teeth stay quiet. So we check the tooth, test its response, and review dental images. We've had patients point to one tooth, the source was its neighbor.
Brief cold sensitivity that stops quickly may need only a filling. Pain that wakes you or returns without a trigger is different. Our office provides root canals in house. We still start by finding the actual cause. But deep decay with lingering pain is different.





