Your teeth are protected by a strong layer of enamel, however if that layer is damaged in any way (through trauma or acid erosion), bacteria can penetrate beyond the enamel and into the dentine that lies underneath. Dentine is much softer than enamel and is easily eroded, which can lead to a hole developing in your tooth (cavity).
If you have a diet that is high in acidic and sugary foods you are at much greater risk of developing a cavity as the bacteria feeds off these elements and produces acids that soften and eventually penetrate the enamel.
To reduce your risk of developing cavities you should brush and floss regularly to remove bacteria and try to avoid eating sugary or highly acidic foods. Make sure you have regular check-ups at Apple Dental so we can treat any tiny lesions before they become larger cavities.