My master bathroom doesn't have a guard in the sink. My wife Daisy dropped a toothbrush and at least one toothpaste cap down there since we got our house. I got the toothbrush out, but it was a pain. I tried getting a sink guard installed but I couldn't figure it out myself. Then I found one of these which were more difficult to find than I imagined. But I knew someone had to make a guard that you didn't have to take apart plumping pipes to use.
It's basically made of simple rubber and it's designed to let water out but keeps everything else out. It's super simple to take in and out. Sure it may look not nearly as "proper" as a traditional sink guard, but I am not complaining.