Which factor does NOT influence the formation of supra gingival calculus?

Tooth color does not play a role in the formation of supra gingival calculus. The development of this type of calculus is primarily influenced by factors such as diet, genetics, and age.

Diet is significant because dietary choices can alter the mineral composition of saliva and lead to increased or decreased calculus formation. For instance, a diet high in carbohydrates may promote bacterial growth that contributes to plaque accumulation, which can subsequently lead to calculus.

Genetics can also have an impact, as certain individuals may have a genetic predisposition that affects their saliva composition or the way their body responds to dental plaque, influencing how quickly calculus forms.

Age is another factor, as the likelihood of calculus formation tends to increase with age due to changes in saliva production, oral hygiene habits, and overall health status throughout life.

Tooth color, however, is determined by factors such as enamel thickness and dentin color and does not have an effect on the biological processes leading to calculus formation.