Remember: Tooth sensitivity is usually a sign there’s something wrong. There are many things that can cause sensitive teeth, including cavities, older fillings, gum disease, worn tooth enamel, exposed tooth roots. Sensitive teeth can be treated. Your dentist may recommend desensitizing toothpaste or an alternative treatment based on the cause of your sensitivity. Proper oral hygiene is the key to preventing sensitive-tooth pain. Ask your dentist if you have any questions about your daily oral hygiene routine or concerns about tooth sensitivity.