Which statement correctly identifies the smallest bristle diameter category?

• A. Soft
• B. Medium
• C. Hard
• D. Very soft

Answer: (A)

The main idea is that bristle diameter generally tracks with stiffness: thinner diameters are softer, thicker ones are harder. In this set of categories, the named options progress from softer to harder as Soft, Medium, Hard. The option labeled Very soft isn’t treated as a separate diameter category in this context, so among the given choices, Soft represents the smallest bristle diameter. This matters clinically because softer, thinner bristles are gentler on delicate primary teeth and gingiva, reducing the risk of abrasion while still cleaning effectively.