Which of the following factors contributes to the development of dental caries?

The frequent consumption of sugary foods is a primary factor contributing to the development of dental caries. When sugar is consumed, it interacts with the bacteria in dental plaque, leading to the production of acids. These acids can demineralize the enamel, the hard outer layer of the teeth, and over time can create cavities. The more often sugary foods are consumed, the more frequently the acids are produced, increasing the risk of caries formation.

In addition to sugar, other factors such as oral hygiene practices and the presence of saliva can influence caries development, but their roles are more about prevention and buffering effects rather than being direct contributors to the initiation of cavities. For instance, while saliva does have a buffering capacity that helps neutralize acids in the mouth, and daily tooth brushing can remove plaque and debris, the act of frequently consuming sugar directly initiates the caries process. Regular dental visits can help detect and treat caries but do not contribute to their development. Therefore, among the given options, the frequent intake of sugary foods stands out as the direct and significant contributor to the formation of dental caries.