A cavity needs to be filled when decay has penetrated the enamel of the tooth. Depending on the size of decay, a crown may be necessary instead. If a cavity is left untreated, the tooth has a much shorter life.
Factors that cause cavities:
• Bad or incorrect oral hygiene habits (Not flossing or brushing)
• Dietary habits (such as eating sugary or acidic foods)
• Missing routine cleanings and check-ups