What is a common reason for the failure of a sealant?

Moisture contamination during the application of sealants is a well-documented reason for sealant failure. Sealants are designed to bond effectively to the tooth surface to prevent decay, and the presence of moisture can significantly undermine this bond. When a tooth is not completely dry during the application, the sealant may not adhere properly. This can lead to gaps or incomplete coverage that allow bacteria and food particles to infiltrate, ultimately resulting in a failure of the sealant to protect the tooth as intended.

In contrast, inadequate light affects the curing process but does not directly cause sealant failure unless it leads to inadequate curing. Incorrect shade selection is primarily a cosmetic consideration and doesn't affect the sealant's functional effectiveness. Improper mixing of materials is relevant for materials that require a specific formulation, but sealants typically come pre-mixed or in forms that do not require mixing specific components together. Therefore, moisture control is critical during application, emphasizing the importance of having a clean and dry surface for optimal sealant adhesion.