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Understanding the Stages of Tooth Decay: From Early Signs to Treatment

Tooth decay – it’s easy to hear that term and jump to conclusions about what it means and what it looks like. Most of us imagine tooth decay as a nasty black cavity on one of our molars and, while this is correct, there’s actually more to tooth decay than that.

The fact is that decay happens before these black spots appear. And sometimes, decay isn’t visible from the surface.

That’s why we’ve outlined a guide on understanding the stages of tooth decay from early signs to treatment. Victorian Dental Group explains:

Stages of tooth decay

First, let’s outline the stages of tooth decay in a case where there’s no intervention from a dentist. Then, we’ll discuss treatment and when it’s best to intervene. The stages of tooth decay appear as:

  1. White spot legions

    Before a dental cavity forms, the tooth develops white spot legions which represent decalcification. This is caused by a build-up of plaque, due to insufficient or ineffective brushing. During this stage of decay, x-rays won’t reveal decay under the surface. Usually, white spot legions can be reversed with proper brushing and a fluoride treatment with the dentist.



  2. Enamel decay

    If the lesions progress, enamel decay begins to occur. The enamel is the layer under your tooth’s surface. This stage is visible in x-rays as a shadow under the tooth’s surface, and is unable to be resolved without dental treatment.



  3. Dentin decay

    If left to progress, tooth decay spreads to the dentin, with bacteria eating through your layer of enamel. Once the porous dentin is affected, decay spreads quickly and it’s common to experience sharp pain and sensitivity.



  4. Dental pulp infection resulting in root canal

    Inside your tooth is a soft tissue chamber known as the dental pulp, and this is the next part of the tooth to be affected by tooth decay. Tooth decay causes the dental pulp to become infected, forming a pus which kills nerves and blood vessels in the tooth. This is a painful experience, and root canal surgery is required.



  5. Abscess formation and tooth extraction

    The final stage is the formation of an abscess which occurs when the bacteria in your dental pulp spreads to your jawbone and gum tissue. Not only can this require tooth extraction, but also infection control and procedures that restore the damaged structures like your gums.

When should you treat tooth decay?

As soon as possible. At Victorian Dental Group, our aim is to spot signs of tooth decay before it even reaches stage one. Our team of dedicated and highly skilled dentists and hygienists constantly monitor your teeth, keeping an eye on areas of concern. If decay has begun, we conduct diligent work to prevent it from getting worse, restoring your tooth to its original healthy state. Book in for an appointment with Victorian Dental Group and see Melbourne’s best team of dental professionals.

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PREVENT

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RECREATE

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We are taking a short break

The clinic will be closed from Thursday 2nd April 2026, and will reopen on Tuesday 7th April 2026. Online booking remains available for scheduling appointments.

Victorian Dental Group will be closed for annual maintenance on 3rd and 4th of October. Online booking remains active and our team will be available from Monday 7th October. 

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