Titanuim is in the nature of low density and corrosion resistant, so ti is widely applicated in massive product. Nowadays it is thought of a fashion style to wear titanium rings. However, is wearing titanium rings dangerous?
The main danger from wearing a titanium ring would likely be that since it’s extremely hard to cut into (many jewelers don’t have tools to accomplish this easily), if the ring were to get stuck on your finger from an injury, or from swelling due to some health issue, you’d have to get a medical professional to cut it off with a diamond-bitted ring cutter or similar (and no, the ring can’t be repaired afterwards).
So, in particular you’d want to make sure it fits you alright, not too tight, and check that you can remove it easily from time to time as you wouldn’t want it to get stuck there. I’ve seen people who never remove their rings gain weight or have swelling in their fingers due to medication changes, and then physically can’t remove their rings at all. With gold or silver or platinum, they’re quite easily cut off…with alternative metals, specialized equipment may not be the most convenient thing to locate in an emergency.