What could indicate an improper application of a sealant?

An indication of an improper application of a sealant is the presence of rough or uneven surfaces. When a sealant is applied correctly, it should create a smooth, even layer over the tooth's pits and fissures. The primary purpose of dental sealants is to provide protection against decay by sealing off these vulnerable areas. If the surface is rough or uneven, it can make the sealant less effective, as it may trap food particles and bacteria, increasing the risk of dental caries.

Additionally, rough surfaces can also lead to discomfort for the patient and can potentially impact the occlusion, causing problems with biting or jaw alignment. Therefore, assessing the smoothness and uniformity of the sealant surface is crucial in determining its proper application.