Stop Words From Breaking In Twentytwelve theme

Is there a way to stop words splitting at the end of the line. I’ve got rid of the hyphens, but want the word pushed down to the next line if it is too long. Is there css that will do this, or do I need to remove some Css. It would appear to be a twenty twelve issue, as the words are pushed down to the next line not broken in twenty eleven, Earl