How Long Can a Cavity Go Untreated?
Not long. Tooth decay can progress from early enamel damage to a small cavity within about six months, and reach the softer dentin layer in another six to twelve months. Once decay reaches the inner pulp, you're looking at a root canal or extraction instead of a simple filling. The exact timeline varies from person to person, but a cavity never heals on its own, it only gets bigger.
The Stages of an Untreated Cavity
Enamel demineralization (months 0–6): Decay starts as weakened spots on the enamel. At this stage there's often no pain, and early damage can sometimes be reversed with fluoride treatment.
Cavity forms in the enamel (around 6 months): A hole develops. It's small, usually painless, and fixable with a simple filling. This is the cheapest point to treat it.
Decay reaches the dentin (6–12 months): The softer layer under the enamel decays faster than enamel does. You may notice sensitivity and discomfort. The filling needed is now larger.
Decay reaches the pulp: Once bacteria hit the nerve, you may experience real pain and infection. Treatment jumps from a filling to a root canal or extraction.
Abscess: An untreated infection can form an abscess, posing a life threatening risk if the infection spreads. It becomes a medical emergency, not just a dental one.
Why Timelines Vary
How fast a cavity progresses depends on your oral hygiene, diet, saliva flow, and where the cavity sits. A cavity between teeth or along exposed root surfaces or near the gumline can grow unnoticed for longer. That's why some cavities take years to cause trouble and others need treatment within months.
Don't Wait for It to Hurt
Pain is a late symptom. By the time a cavity hurts, it's usually past the simple-filling stage. You may now need a root canal treatment. Regular checkups catch decay while it's still small, inexpensive, and painless to fix.If you suspect a cavity, or it's been a while since your last checkup, request an appointment at our Port Coquitlam clinic. Catching it early is the least expensive option.
