IT DOES SAY that if you stop using fair and love, your colour may go back to its original state as it was before you began applying. so its written on the website and box. its jsut a matter of using it dauly.forever. just like you would use any moisuturiser for ever.
Darker skin naturally has more melanin than fair skin, which protects the skin from the sun's rays. Fairness creams inhibit the production of melanin....making your skin more vulnerable to the sun...thus increasing your sensitivity to the sun which can cause rapid aging and even skin cancer.
You're supposed to use sunscreen whenever you go out during the day.....BUT....especially with skin lightening products.