What is an essential benefit of fluoride application?

Fluoride application is essential primarily because it helps in remineralizing enamel. Enamel, the outer layer of the teeth, can become demineralized due to the acids produced by bacteria in dental plaque. This demineralization leads to an increased risk of tooth decay. When fluoride is applied, it gets incorporated into the enamel and promotes the redeposition of minerals, contributing to the repair of early decay and strengthening the teeth against future acid attacks. This process not only helps in reversing early signs of caries but also enhances the overall durability of the enamel.

The other options do not reflect the scientifically supported benefits of fluoride. For instance, making teeth look larger does not relate to fluoride’s role and is not a benefit of fluoride application. Similarly, while fluoride can contribute to an overall healthier mouth, it doesn't directly eliminate bad breath, which is often caused by factors unrelated to enamel health. Lastly, fluoride does not accelerate tooth decay; rather, it plays a protective role against it.