I got this for my kids’ toothbrushes because who knows where they put those things ! At first I used the suction cup because I was waiting for my husband to screw it to the wall. I wasn’t surprised when the suction cup kept coming loose and falling off the mirror. After we screwed the toothbrush holder to the wall, it worked perfectly (and if you can’t screw anything into your walls, you can still get the sanitizing effect by laying the toothbrush holder on your sink vanity with the suction cup facing downward )