The 32-year-old Brazilian told The Sun: "They saved my life. They cushioned the impact of the blow. I would be dead without them.
"My breasts stopped my face and my head being hit. I am so thankful for them."
Sheyla, who has had at least ten boob jobs and plans to increase her bust size to 38MMM, crashed near her home in Houston, Texas.
She said: "I was on my way to meet my husband and our two kids at a friend's house but I started to feel dizzy.
"I swerved to avoid a dog and ended up writing off my car. I hit a tree, spun round three times and then hit another tree on the other side of the road. "But I am OK. It could have been much worse."
Sheyla puts the dizzy spell down to medication she takes for depression and pain relief.
Source: The New Statesman.