The only data I've ever seen where the airbag adds a measure of safety is in a very severe accident where it can prevent you from breaking your jaw on the steering wheel. (autoline.tv)
Plus, they have a soft, light texture, so they won't break your jaw when you're chewing»em. (health.com)
He had so many rotten teeth that the vet accidentally broke his jaw with the removal of his teeth. (lostangelsanimalrescue.org)