Nuk Sauger Nipple has been designed to prevent the problem of:

Children who have the habit of thumb sucking derive the pleasure from keeping their finger/thumb at various depths of mouth.  Initially, they start this at conscious level and soon it goes to the subconscious level.  If it is not intervened, it will alter the muscle balance and might cause malocclusion.  Along with this, it also alters the way the child sucks the nipple.