In which the tooth material is dissolved by toxins and acid released by the microbes, ultimately leading to the formation of a hollow, debris-filled cavity in the tooth.
It may range in colour from yellow to black in later stages.
Tooth decay in children is also becoming a prevalent problem in the modern era, and they are adopting unhealthy lifestyles and consuming high-sugar-content food such as candies and chocolates from a very tender age, leading to early tooth decay.