What is the primary type of calculus that forms above the gum line?

Supra gingival calculus is the primary type of calculus that forms above the gum line. This type of calculus typically accumulates on the teeth and is visible in areas such as the buccal surfaces of molars and the lingual surfaces of incisors, often due to saliva's mineral content.

Supra gingival calculus is usually white or yellowish in color and can be easily detected during a dental examination. Its formation occurs when plaque, a soft biofilm of bacteria, hardens due to mineral deposits from the saliva. Regular oral hygiene practices, such as brushing and flossing, can help reduce its accumulation.

Understanding the characteristics and location of supra gingival calculus is vital for dental professionals in order to prevent periodontal disease and to educate patients about maintaining good oral health.