Classify the following changes into fast and slow changes.
tooth decay

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Tooth Decay**: Tooth decay is a process that occurs when bacteria in the mouth produce acids that eat away at the enamel of the teeth. This process is not immediate and takes time to develop.

2. **Duration of Tooth Decay**: The video transcript mentions that tooth decay can take months or even years to occur. This indicates that it is not a rapid change.

3. **Classification of Changes**: Changes can be classified into two categories: fast changes and slow changes. Fast changes occur quickly, while slow changes take a longer time to develop.

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