The common term for dental caries is tooth decay. In the past, many people believed that tooth decay was caused by a kind of "tooth worm" that eroded the teeth, leading to tooth damage. In fact, it's the presence of a large amount of dental plaque and tartar on the teeth, and the erosion caused by numerous bacteria on these surfaces, which is what we now refer to as the phenomenon of caries, causing the teeth to turn black. Severe erosion can affect the enamel and dentin, and if it breaks through to the dental pulp, severe pulpitis can occur. When suffering from dental caries, it is essential to seek early treatment to remove the necrotic enamel and further prevent its progression.