Which statement is NOT a negative effect of coronal polishing?

The statement regarding decreased fluoride uptake is not a negative effect of coronal polishing because the primary purpose of coronal polishing is to remove extrinsic stains and plaque from the surfaces of the teeth, which can contribute to better oral health and can actually enhance fluoride effectiveness.

Fluoride works by being absorbed into the outer surface of the enamel and making it more resistant to decay. During the coronal polishing process, if proper technique and materials are used, fluoride from the toothpaste or professional fluoride treatments can still effectively adhere to the enamel after polishing, maintaining its protective benefits.

In contrast, the other effects mentioned can indeed be associated with coronal polishing. Increased tooth sensitivity can result from the removal of plaque or layers of enamel that protect the dentin, leading to more exposure of sensitive areas. Enamel abrasion can occur if too much pressure is applied or if abrasive materials are improperly used during the polishing procedure. Gingival irritation might arise due to the technique used during polishing or from the abrasives irritating the gingival tissues, which highlights the need for careful technique and material selection.