Misoji wo Koeta Ossan no Kimama na Isekai Slow Life.

Sōjirō Katsuragi dies from illness at the age of thirty-eight after a life seemingly plagued by bad luck. Taking pity on the perpetually unfortunate man, a goddess offers him the chance to begin again in another world and grants him blessings before his reincarnation. Sōjirō doesn't ask for incredible magic or overwhelming strength. After spending his previous life in poor health, all he wants is a healthy body that will let him peacefully enjoy his second chance at life. Instead, the goddess gives him two rather ridiculous blessings: “Immortality” and an “Indestructibly Strong Jaw.”

Those abilities turn out to be far more powerful than Sōjirō expected. Even after reincarnating, his terrible luck continues to throw him into one disaster after another, from encounters with calamity-class monsters to trouble with thugs at the Adventurers' Guild. The difference is that this time, he's practically impossible to kill. All Sōjirō wants is a relaxed second life, but between his absurd blessings and seemingly supernatural ability to attract trouble, his supposedly carefree isekai adventure quickly becomes anything but ordinary!