or any other desensitzing toothpaste is not going to take care of the sensitivity caused by decay, fracture
or crack in the tooth.
These tooth paste are used only for minor sensitivities where the above conditions are absent.
First thing to do is get thorough dental check up done to rule out this things.
Is sensitivity generalized or in any particular tooth?
When does it aggravate?
Does it stay even after removal of stimulus e.g. cold
Is there sensitivity to heat as well?