Teeth scraping????

My fiance loves bjs but I have a very small mouth and he has a very big dick lmfao. I have to open my mouth all the freaking way to even fit half of him.

When I try to cover my teeth with my lips, I end up cutting the inside of my lips with my teeth and my molars still scrape him!

How can I suck dick well, while not scraping him or cutting my mouth lmao???