Cavity preparation is a dental procedure that involves removing decayed tissue from a tooth to prevent further damage. The dentist uses specialized tools to clean out the affected area, ensuring that all decay is eliminated. This process helps restore the tooth's structure and function. After the decay is removed, the dentist will fill the cavity with a material such as composite resin or amalgam. This filling seals the tooth, protecting it from bacteria and restoring its strength. Proper cavity preparation is essential for maintaining oral health and preventing future dental issues.