<div class="container">
<div class="normal">
  <p>Esternocleidomastoideo</p>
</div>
<p>Con <code>word-break: break-all;</code> e <code>hyphens: auto;</code></p>
<div class="normal hyphenation" lang="es"
     <p>Esternocleidomastoideo</p>
</div>
</div>
body {
  font-family: sans-serif;
  font-size: 16px;
  line-height: 1.5;
  background: #eee;
  color: #333;
}

.container {
  width: 80%;
  margin: 1em auto;
  padding: 1em 5%;
  background: #fff;
}
h1, h2 {
  margin-bottom: .5em;
}
h1 {
  font-size: 2em;
}
h2 {
  font-size: 1.6em;
}

p {
  margin-bottom: 1em;
}
.normal {
  width: 100px;
  background: #f1f1f1;
  margin-bottom: 10px;
}
.hyphenation {
     word-break: break-all;
     /* Non standard for webkit */
     word-break: break-word; */
  
-webkit-hyphens: auto;
   -moz-hyphens: auto;
    -ms-hyphens: auto;
        hyphens: auto;
}
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