Some of the substances in gels for sensitive teeth can reduce the transmission of painful stimuli, without being actual anaesthetics. The only lasting method is one that can be implemented by your dentist. This involves remineralising the tooth with fluoride, or protecting exposed dentine with varnish, composites or through operations that cover the exposed necks of the teeth with the gums. However, there are also toothpastes designed for sensitive teeth, like the Elgydium Sensitive toothpaste to be used on a daily basis.