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The pulp becomes swollen and irritated from the bacteria. As tooth decay develops, the bacteria and acid continue their march through your teeth, moving next to the inner tooth material (pulp) that contains nerves and blood vessels. Dentin has tiny tubes that directly communicate with the nerve of the tooth causing sensitivity. This layer is softer than enamel and less resistant to acid. Once areas of enamel are worn away, the bacteria and acid can reach the next layer of your teeth, called dentin.

This erosion causes tiny openings or holes in the enamel - the first stage of cavities. The acids in plaque remove minerals in your tooth's hard, outer enamel. Tartar makes plaque more difficult to remove and creates a shield for bacteria. Plaque that stays on your teeth can harden under or above your gum line into tartar (calculus). When sugars and starches aren't cleaned off your teeth, bacteria quickly begin feeding on them and form plaque. It's due to eating a lot of sugars and starches and not cleaning your teeth well. Dental plaque is a clear sticky film that coats your teeth. Cavities are caused by tooth decay - a process that occurs over time.

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