Final answer:
The 'Particle size of the polishing agent' is not a factor in the rate of tooth surface abrasion when performing extrinsic stain removal with a polishing agent. The correct option is d.
Step-by-step explanation:
The factor that is NOT a concern in the rate of tooth surface abrasion during extrinsic stain removal with a polishing agent is the 'Particle size of the polishing agent'. Factors that do affect the rate of tooth surface abrasion include the pressure applied during polishing, the abrasiveness of the polishing agent, and the speed of the polishing tool.
Abrasives are a significant component in toothpaste, constituting at least 50% of the typical formulation. These abrasives, such as aluminum hydroxide (Al(OH)3), calcium carbonate (CaCO3), and various silicas, are crucial in removing plaque and promoting oral health by preventing the accumulation of tartar.
However, when it comes to the abrasion rate during tooth polishing, the particle size does not play a direct role; rather, it's more about the hardness and irregularity of the particles which contribute to the polishing action.
Hence, Option d is correct.