What is the texture of supra gingival calculus compared to tooth enamel?

Supra gingival calculus is generally rougher than tooth enamel. This increased roughness occurs because calculus forms from the mineralization of plaque that accumulates on teeth. Its surface is often uneven and porous, which can contribute to the retention of plaque and bacteria, potentially leading to periodontal issues if not managed properly.

Tooth enamel, on the other hand, is the hardest and smoothest substance in the human body. It serves as a protective outer layer for teeth and is composed primarily of hydroxyapatite, which gives it its strength. Because of enamel's smoothness, it minimizes plaque retention and makes it easier to maintain oral hygiene.

The other choices, such as smoother, finer, or softer, do not accurately represent the relationship between supra gingival calculus and tooth enamel, as they imply characteristics that are not present in calculus compared to enamel. The notable difference in their textures is crucial for understanding dental hygiene and the importance of professional cleanings to remove calculus from teeth.