What is a primary reason for preparing teeth for sealants or orthodontic appliances?

Preparing teeth for sealants or orthodontic appliances primarily involves smoothing the tooth or restoration surface. This preparation is crucial because a smooth surface ensures better adhesion of the sealant or appliance, leading to a successful application. When the surface is adequately prepared, it minimizes the risk of air pockets or imperfections that could compromise the bond between the tooth and the material used.

Additionally, a well-prepared surface also allows for an even distribution of the sealant material, ensuring optimal protection against caries and effective function of orthodontic appliances. The smoothness achieved through this preparation helps in enhancing the longevity of the sealants and the effectiveness of orthodontic treatments, as they can better withstand the forces of biting and chewing without failure.