100% safe chews do not exist.
A lot of people on YT like bully sticks, Nylabones, marrow bones, CET chews, etc.
They each have an upside and a downside. The really hard ones that they can't get pieces off of to swallow can easily break teeth. The softer ones that they can get pieces off of can cause obstructions. Rawhides can cause esophageal obstructions and should not be given. Some chews like pig ears (and debatably bully sticks) carry large amounts of bacteria that you may not want a pup chewing on your couch.
When in doubt, talk to your vet because if something does go wrong one day from the chews you use, they will be the one fixing the problem... Always good to see what they feel are the safest.
We do stuffed animals and stuffed animals only here.