QUESTION:
What about gum recession?

ANSWER:
Some people have gum recession on one or more teeth. Usually the root surface which becomes visible as gums recede has an appearance which is somewhat darker than the rest of the tooth. This is because root surfaces are not covered by enamel but are instead composed of another naturally darker material called "dentin".

The Lab Direct™ Teeth Whitening Process won't effectively lighten dentin. This means that the color of the root portion of the tooth (which shows where the gum recession has occurred) will not change noticeably as a result of your teeth whitening efforts.