Exposure X has a brand new photo brushing system that allows you to make changes to specific parts of your image. For example, you can whiten teeth, dodge and burn, or sharpen eyes. Any effect in Exposure can be brushed on a photo, eliminating the need for a round trip to another program.
It’s also possible to stack effects, a frequently requested feature. With photo brushing, you can precisely control where each effect is applied to your image.
Brushing is available when using Exposure as a plug-in for Photoshop and Lightroom, as well as when using Exposure as a standalone app. In standalone mode, changes made by brushing are nondestructive and can be edited later.
Here is a tutorial video which shows you how photo brushing works. Enjoy!