What are the Chracteristic's of an effective toothbrush?
A. Conforms to indiv. pt. size, shape, & texture
B. Easily & efficiently manipulated
C. Is readily cleaned & aerated; impervious to
D. Is durable & inexpensive
E. Functional properties of flexibility, softness, & diameter of the bristles/filaments , strength, rigidity, and lightness of the handle
G.Is designed for utility,efficiency, & cleanliness