Cavities are small holes that form in your teeth due to decay. This decay happens when bacteria in your mouth produce acids that eat away at the tooth's surface. If not treated, cavities can lead to pain and even tooth loss. Good dental hygiene, like brushing and flossing, can help prevent cavities. Regular visits to the dentist are also important for catching cavities early. The dentist can clean your teeth and apply fluoride treatments to strengthen them. Eating a balanced diet and limiting sugary snacks can further protect your teeth from cavities and keep your smile healthy.