Influence of Starch Digestibility on Oral Microbial Ecology and Dental Caries: Implications of Millet-Based Diets: A Comprehensive Review

Oral caries is a multifactorial infection that involves dietary, microbial, and host factors, the influence of carbohydrate sources on which has become an area of greater interest. This research paper discusses the relative effect of millets and cereals on caries development with special reference to biochemical interactions with salivary amylase and the associated metabolic byproducts that have an effect on the cariogenic process. A literature review of peer-reviewed papers across oral pathology, biochemistry, and nutritional science was conducted to explain the impact of structural variations in starch composition on oral enzymatic breakdown. Millets, which are commonly rich in resistant starch, are compared with conventional cereals, which commonly have more easily digestible starch profiles. Salivary amylase hydrolyses starches to simpler sugars, an activity that may differ in efficiency based on the substrate, which in turn changes the oral pH environment and influences biofilm formation. In addition, the research assesses how these metabolic variations regulate the oral microbiome, specifically the growth of cariogenic bacteria like Streptococcus mutans, thus affecting enamel demineralization. The results imply that the characteristic starch architecture of millets can result in diminished acidogenicity relative to cereals and thereby confer protection against caries. These observations have important ramifications for dietary guidelines and preventive approach formulation in dentistry, illuminating the interrelationships between diet, enzymatic action, and oral microbial ecology in cariogenesis. This research attempts to fill the gap between dental clinical practice and nutritional science, providing a framework to facilitate the growth of preventive oral health care.