Yeah, the OXO Good Grips Compact Toilet Brush can definitely reach under the toilet rim. The manufacturer's description mentions that it's got a tapered head and sturdy bristles specifically for getting into those tight spots.

According to our research, a lot of people say it works well for cleaning under the rim and other hard-to-reach areas. The angle of the bristles seems to be just right for that job.

Plus, the handle is compact, so it's easy to maneuver, which makes the whole cleaning process a bit less of a hassle. Another nice touch is the replaceable brush head.

The manufacturer points out that you can replace the brush head, which is great for keeping things hygienic without having to buy a whole new brush. Just a heads-up: some folks find the initial unscrewing a bit tough, since it's on pretty tight.

Maybe give it a bit of a loosen once you get it off the first time to make future swaps easier.

All in all, it looks like a solid pick if you need something that can really clean those tricky spots under the rim.