Make sure you change your toothbrush every two months or so. If you use an electric toothbrush, change the head as often. The bristles become frayed and less effective. They can also be tougher to clean properly, making them a haven for bacteria, so throw them out after two months.
Bleaching your teeth is an efficient way to get a whiter smile but you could actually damage your teeth by bleaching. It is best to avoid bleaching if you have sensitive teeth or gum disease. Talk to your dentist if you are not sure whether or not bleaching is safe for you.