2 weeks ago one of my teeth was hurting and especially
sensitive to cold fluids.
My dentist advised me to use fluoride mouth rinse.
My tooth pain has got a lot better with the fluoride rinse.
If you were to continue using the fluoride rinsefor a long period of time (measured in years, not weeks or months) the pain would eventually go away completely. Because by then the natural tooth will probably have been replaced by a very expensive post and crown.
But then if your drinking water is fluoridated the result will likely be the same whether or not you continue using the rinse.