The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From MagiClick Digital Solutions:
Tooth Fairy, is a collection of enjoyable applications which are prepared by Colgate for you and your family. Inside this application you can find; A funny game in which you will try to protect your teeth against invading bacteria, An album in which you will schedule your childs tooth cut/loss times, locating the cut/lost teeth on the tooth map and adding photos, A special section for moms in which you will find important information for oral and dental health for you and your child and record your brushing together with your children, A useful application that will help you find which Colgate product is the right one for you.