A dry mouth, a condition known as xerostomia, is linked to a higher rate of tooth decay for several reasons. Saliva plays a crucial role in maintaining oral health, and when there is a reduced flow of saliva or a dry mouth, it can create an environment in which dental problems are more likely to occur.

Dental cavities, also known as caries or tooth decay, are damaged areas in the hard surface of your teeth that develop into tiny openings or holes. Cavities are caused by a combination of factors, including bacteria in your mouth, frequent snacking, sipping sugary drinks, and not cleaning your teeth well.

Sugar is a carbohydrate found naturally in many foods and commonly added to processed foods, known for its sweet taste. When sugar is consumed, oral bacteria feed on it and produce acids as a byproduct. These acids attack tooth enamel, the hard, protective outer layer of teeth, leading to demineralization and the formation of cavities. Repeated acid attacks can cause the enamel to break down, resulting in tooth decay. Additionally, sugary foods often stick to teeth, providing a constant food source for bacteria, thus increasing the risk of dental problems if proper oral hygiene is not maintained.