In-office fluoride treatments can be an effective way to reduce the risk of decay and alleviate tooth sensitivity. Fluoride strengthens the enamel, making it more resistant to cavity-causing bacteria and reducing pain from cold food and drink, air, and sweets. Fluoride gel is frequently applied to the teeth of patients under the age of twenty, when decay is most prevalent, but patients of any age may reap the benefits of fluoride treatment, especially if they are at high risk for decay or suffer from excessive sensitivity.