Tooth cavities are one of the most common dental problems, but they are largely preventable. Brush your teeth twice daily, floss regularly, reduce sugary snacks, and choose a balanced diet rich in fruits, vegetables, and dairy products. Children should receive regular dental checkups and fluoride treatments to protect developing teeth. Adults should also maintain routine cleanings and address early signs of decay promptly. Good oral hygiene and preventive dental care are the keys to a cavity-free smile.