A new toothbrush features bristles that stand straight and close together. They create a firm, even surface across the brush head, appearing uniform from base to tip.
The first changes emerge gradually at the ends. Tips of individual bristles diverge slightly, introducing faint separations between neighboring filaments while the bases remain aligned.
Extension of Separation
These separations progress along the length. More bristles bend outward midway, expanding the brush head's profile. Gaps become visible across larger areas, altering the once-compact arrangement.
Flattening and Matting
Further along, the bristles flatten toward their tips. Filaments clump in places and splay unevenly in others, reducing the surface's uniformity. The brush head now shows a broader, less defined edge.
This progression marks the toothbrush bristles' shift from a tight formation to a dispersed and deformed state, visible through successive observable stages.