Actually speaking please don't go to the ads on TV you should consult dentist the regular use of these sensitivity paste will definitely damage your enamel of the teeth. You should undergo the process of oral prophylaxis with polish which will remove all these stains of your tooth.
Never use gel toothpaste. They really harm your tooth.
Teeth have a protective layer called enamel with age the enamel wears off and become thin which causes to become teeth sensitive to cold and hot. You need to get a professional check up done to know the exact cause and solution of your problem. Without checking you clinically we can't suggest anything.
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