I assume you are referring to the <p></p> tag set that TinyMCE automatically wraps the text in?
They are activated by default for a reason - see discussion here: http://tinymce.moxiecode.com/punbb/viewtopic.php?id=3878

However, if you still need to remove them for special reasons, you can remove them in code, in the OnLoad override method of your page:

protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        myEditor.InitOptions["force_p_newlines"] = "false";
    }

Or in your markup:

<script>
            tinyMCE.init({
                force_p_newlines: false
});
</script>


See http://world.episerver.com/Documentation/Items/Tech-Notes/EPiServer-CMS-6/EPiServer-CMS-60/TinyMCE-Developers-Guide/#UsingWebControl   and    http://wiki.moxiecode.com/index.php/TinyMCE:Configuration    for details.

I'm working with EPiServer 7 MVC and I'm trying to get the editor to stop putting in the p tags. But when trying 

<script>
            tinyMCE.init({
                force_p_newlines: false
});
</script> 

the tinyMCE is undefined. Does anyone know what I am doing wrong?

Many Thanks

Got it by using an empty class with the configuration set as an attribute see here

http://stackoverflow.com/questions/11390552/allow-custom-html-attributes-in-tinymce-in-episerver

Also you need to name the plugin in the attribute and add the folder to the tinymce part of themodules folder e.g.

PluginName in attribute 'ConfigTest'

So add the configtest folder here

[App_Data]\Modules\CMS\Util\Editor\tinymce\plugins\ConfigTest

Under this folder add in a blank editor_plugin.js file