Completely, the material used in Evolution bleaching have been used in dentistry for over 100 years.
No Enlighten teeth whitening won't damage your gums or teeth. In fact, the gel used is far less concentrated than that used by most other whitening products.
No, natural teeth rarely look too white. Sometimes very white crowns can look too white because they are made of porcelain.
You can choose the shade of whitening you want. Enlighten bleaching can whiten teeth up to sixteen different shades. Results can vary but if used correctly all teeth will whiten dramatically.