Sensitivity is caused by poor oral hygiene, not flossing all along the tooth into the gum space. It’s also caused by decay, especially when roots are exposed in older people. Extremes of temperature in liquids or foods can cause sensitivity. Leaky fillings can cause sensitivity. Oro-Health will have products, especially a Miracle Desensitizing Toothpaste,TM, and a technique in using it, to help with sensitivity.