关于brush的作文知识

Howtobrushyourteeth?Youshouldbrushyourteethtwiceaday.First,brushyourteeththeinsidesurfaceofyouteeth.Alwaysmoveyourbrushinsmallcircles.Nextbrushtheoutsidesurfaceofyourteeth.Thenbrushthebitingsurfaceofy...