通过CSS3的linear-gradient实现的。

<div class="toothbg"></div>

.toothbg{width:100%;height:20px;background:#41B61A;
background-image:-webkit-gradient(linear,50% 0,0 100%,from(transparent), color-stop(.5,transparent),color-stop(.5,#e5e5e5),to(#e5e5e5)),
-webkit-gradient(linear,50% 0,100% 100%,from(transparent), color-stop(.5,transparent),color-stop(.5,#e5e5e5),to(#e5e5e5));
background-image:-moz-linear-gradient(50% 0 -45deg,transparent,transparent 50%,#e5e5e5 50%,#e5e5e5),
-moz-linear-gradient(50% 0 -135deg,transparent,transparent 50%,#e5e5e5 50%,#e5e5e5);
background-size:30px 15px;
background-repeat:repeat-x;
background-position:0 100%;
}