Tooth sensitivity usually means dentin, the softer layer under the enamel, has been exposed. Gum recession, worn enamel, decay, a cracked tooth or a worn filling are the most common reasons, and recent dental work or whitening can cause it temporarily. A short zing with cold that fades quickly is often from exposed dentin. Sensitivity that lingers or centers on one tooth should be checked.
What can cause tooth sensitivity?
Ten possibilities to discuss with your dentist include:
Exposed roots from gum recession
Loss of enamel from wear
Brushing too forcefully
Acid from food, drinks or reflux
Tooth decay
A cracked tooth
A worn or damaged filling
Gum disease
Recent restorative treatment
Recent whitening
These are possibilities, not a diagnosis or a ranking of which cause is most likely for you. Tell the dentist whether one tooth or several are affected and whether the discomfort stops quickly or lingers. Our guide to why a tooth hurts explains what those patterns tend to mean.
Can certain foods make it worse?
Yes. Acidic, sugary, very cold and very hot foods are the usual triggers, and acidic foods can wear enamel over time. Our post on foods to avoid with sensitive teeth covers the common ones and how to enjoy them with less discomfort.
Can toothpaste help?
Desensitizing toothpaste can help some forms of sensitivity, but it does not repair a crack or cavity. Use it as directed and discuss persistent symptoms. Our toothpaste guide explains how to compare products.
What if the sensitivity began after a filling?
Recent treatment belongs in the history. Read our guide to pain after a filling and contact the treating dentist if the symptoms worsen, linger or occur when you bite. Do not assume every new symptom is part of normal healing.
What if I also grind my teeth?
Mention clenching, morning jaw discomfort and changes in your bite at the appointment. Our bruxism information explains how tooth wear and jaw symptoms are evaluated. A night guard does not take the place of finding the cause of a painful tooth.
When should I have sensitive teeth checked?
Arrange an examination for recurring sensitivity, a single painful tooth or discomfort that interferes with eating. Review emergency dental care if pain is severe or comes with swelling.
Discuss sensitive teeth in Jacksonville
Call CJ Henley, DMD at 904-398-1549 or contact us. Bring the names of products you use and explain when the symptoms started. A comprehensive dental examination can connect the symptom pattern with the condition of the teeth and restorations.
Sources
American Dental Association, MouthHealthy. Sensitive teeth. Accessed October 6, 2026.
Cunha-Cruz J, Wataha JC, Heaton LJ, et al. The prevalence of dentin hypersensitivity in general dental practices in the northwest United States. J Am Dent Assoc. 2013;144(3):288-296. doi:10.14219/jada.archive.2013.0116 (retrieved via PubMed)
About the author. CJ Henley, DMD, is a general dentist in Jacksonville whose practice focuses on cosmetic and restorative dentistry, dental implants and dental care around head and neck cancer. Meet Dr. Henley.
CJ Henley, DMD, PA · 3675 Hendricks Avenue, Jacksonville, FL 32207 · 904-398-1549
Updated October 2026.