hello and welcome to hcm forum,
it seems that you are addicted to chewing tobacco, as you know it can progress to a serious complication,therefore its important for you to quit it.
chewing tobacco will not only affect your teeth but also the surrounding tissue.
i would like to inform you that nowadays nicotine
substitutes like chewing gums are available for people who are unable to quite tobacco. you may easily get it from a pharmacy.
and for the stains,kindly visit your dentist
at regular intervals for full mouth scaling.
i wish you good health.