Need to attach an accessory to a deforming model for your animations? Use this clever technique.
Maya Tutorial : How to Rig Lips in Maya Here is a tutorial how to Rig lips. A video tutorial to clease concepts for lips Rigging. Relatively simple setup for sticky lips using constraints. http://www.allcgtutorials.com/2014/maya-tutorial-how-to-rig-lips-in-maya/