Sugar can trigger canker sores due to several reasons:

Bacterial Growth

Sugar feeds bacteria in the mouth, leading to an increase in bacterial activity and acid production. This can irritate the oral lining and contribute to conditions that favor canker sore development.

Oral Imbalance

Excessive sugar consumption can disrupt the balance of the oral microbiome, potentially triggering inflammation or irritation that leads to canker sores.

Weakened Immunity

A diet high in sugar can suppress the immune system, reducing the body’s ability to fight off minor irritations or injuries in the mouth that may lead to sores.