Mattermouths are enemies in Super Mario Galaxy 2. They appear in galaxies such as the Haunty Halls Galaxy eating away parts of the floor. Mattermouths look like heads of a Dry Bones eating the floor away. The floor does regenerate as time passes. Mattermouths cannot be defeated, but can be stopped by jumping on its head. This also turns them around. If Mario is attacked by a Mattermouth, he loses one wedge of health.