What are the potential long-term hazards of using whitening Toothpaste? 

All toothpaste will help remove surface stains. However, whitening toothpaste has more abrasive formulations and acts more quickly, so you see a result faster. Whitening agents in toothpaste are low and are typically not in contact with your teeth long enough to whiten your teeth. The Abrasiveness helps remove stains from your teeth—agents such as silica, calcium carbonate, or dicalcium phosphate. The potential hazard of using tooth-whitening toothpaste is that long-term use of these heavily abrasive toothpaste will eventually weaken enamel to the point where plaque and bacteria begin to damage the teeth. All toothpaste has some abrasiveness, but before using whitening toothpaste long-term, talk to your dentist to see what is best advised.