Fluoride is effective in the prevention of tooth decay. Since we are all susceptible to tooth decay, we all need fluoride toothpaste.
Children may use children toothpaste which contains a lower concentration of fluoride, and parents should have close supervision on their brushing. This can prevent them from ingesting fluoride excessively.
When your teeth feel sensitive, you should first go to see a dentist to find out the cause. You should seek opinion about using desensitizing toothpaste from your dentist.
Consult your dentist before you start using whitening toothpaste.