What is the defining characteristic of supra gingival calculus?

Supra gingival calculus is characterized by its location above the gum line, making it visible during a clinical examination. This type of calculus typically forms in areas where saliva can easily deposit minerals, such as near the salivary glands, and becomes a hard, mineralized deposit on the tooth surface. Its visibility allows dental professionals to assess and address it effectively during routine examinations and cleanings.

While supra gingival calculus can often be removed through professional cleaning, it may not always be entirely eliminated by daily brushing alone. This distinguishes it from the idea that it would always be removable just through brushing, hence the incorrectness of that statement. Additionally, the other options either misrepresent its visibility or incorrectly describe its location, further reinforcing that the defining characteristic is indeed its presence above the gum line.