What is the correct amount of fluoride gel or foam to be placed in a fluoride tray?

The optimal amount of fluoride gel or foam to place in a fluoride tray is about a third full. This quantity ensures adequate coverage and contact with the teeth while preventing overflow that can occur if the tray is filled too much.

When the tray is only a third full, it allows for sufficient fluoride exposure to help with remineralization of enamel and to provide a protective effect against decay. It also reduces the risk of swallowing excess fluoride, which could lead to gastrointestinal upset or other issues.

Filling the tray completely or even half full can increase the risk of the gel spilling into the patient's mouth, leading to discomfort and a higher chance of the patient swallowing the fluoride, which is not ideally recommended, especially for young children. Similarly, a quarter full might not provide enough fluoride for effective treatment. This careful measurement helps ensure that treatments are both safe and effective for patients.