Smiley piercing dilemma!

So, ive had my smiley done for about 2 years and i usually wear a plastic horseshoe bar however im beginning to think it might destroy my teeth🤔 because of that, i bought a banana bar but everytime i close my mouth the bar is sliding sideways and falling down onto my teeth and making the piercing area hurt!

Ive seen many people wear the banana bars because of work etc and they dont have a problem, so is there anything i can do to stop it or can i buy a shorter one from somewhere?