Which of the following is not a benefit of fluoride?

Fluoride is known for its numerous dental benefits, particularly in the prevention of dental caries, reducing hypersensitivity, and strengthening tooth enamel.

The prevention of caries is one of fluoride's primary functions, as it helps to remineralize areas of tooth demineralization and inhibits the growth of harmful bacteria that contribute to tooth decay. Additionally, fluoride plays a significant role in reducing dental hypersensitivity by blocking the pathways through which stimuli reach the nerves within the teeth. Strengthening enamel is another major benefit, as fluoride incorporates into the structure of the enamel, making it more resistant to acidic conditions and decay.

On the other hand, excessive whitening of teeth is not a benefit attributed to fluoride. While certain whitening treatments can involve fluoride, fluoride itself does not function to whiten teeth excessively. Hence, this option stands out as an incorrect depiction of fluoride's benefits in dentistry.