What is the purpose of finishing and smoothing after instrumentation?

• A. To brighten tooth color
• B. To minimize roughness on the surface
• C. To reduce plaque accumulation by creating a smooth surface and remove any roughness.
• D. To remove calculus during finishing

Answer: (C)

After instrumentation, the goal of finishing and smoothing is to create a uniformly smooth tooth surface so plaque and bacteria have fewer places to cling to. Instrumentation leaves micro-scratches and irregularities that can harbor biofilm and make cleaning by the patient harder. By polishing and removing those tiny rough spots, the surface becomes less retentive for plaque, which helps reduce calculus re-formation and gingival irritation, and it can improve patient comfort during touch or brushing.

This step isn’t primarily about brightening tooth color, and calculus removal should be completed during the initial instrumentation, not during finishing and smoothing. So the best choice emphasizes reducing plaque accumulation by producing a smooth, defect-free surface and removing roughness.