Tooth decay is a common dental health issue that can be caused by poor oral hygiene habits and diets high in sugar. When bacteria build up on the surface of teeth, they produce acids that eat away at the enamel and create pockets on the tooth surface. These cavities are called “decay”, and if left untreated, they can cause pain, infection, and even loss of teeth.
Reference: https://www.northpointedental.com/blog/tooth-decay-prevention-10-daily-dental-care-tips/