How Teeth Become Sensitive
Teeth sensitivity is a sharp, sudden discomfort that happens when a tooth reacts to something hot, cold, sweet, acidic, or even brushing. It is usually caused by exposed dentin or an irritated tooth nerve, and it can range from mild and occasional to intense and persistent.
Common causes of tooth sensitivity
- Enamel wear: Brushing too hard, acidic foods, or grinding can thin enamel and expose sensitive layers.
- Gum recession: When gums pull back, the root surface is exposed and can be very sensitive.
- Cavities or cracked teeth: Damage can allow temperature and bacteria to reach deeper tooth structures.
- Worn fillings or dental work: Restorations can break down over time and create sensitivity.
- Recent dental treatment: Sensitivity can be temporary after cleanings, fillings, crowns, or whitening.
When sensitivity is a sign of a bigger issue
If sensitivity is lingering, getting worse, or happens without a clear trigger, it may signal decay, a crack, gum disease, or an inflamed nerve. Pain that is spontaneous, throbbing, or wakes you up can be a sign the tooth needs more urgent care.
At-home ways to reduce sensitivity
- Use a desensitizing toothpaste: Give it 2 to 4 weeks of consistent use for best results.
- Brush gently with a soft brush: Hard brushing can worsen enamel wear and gum recession.
- Avoid frequent acidic snacks and drinks: Sip water after acidic foods to help neutralize acids.
- Address grinding or clenching: A night guard may help if bruxism is contributing.
In-office treatments that may help
Depending on the cause, your dentist may recommend fluoride varnish, bonding to cover exposed root surfaces, treating cavities or cracks, replacing restorations, or managing gum recession. If the nerve is inflamed or infected, root canal treatment may be needed.
When to see a dentist
Schedule an evaluation if sensitivity lasts longer than a couple of weeks, is limited to one tooth, is severe, or comes with swelling, bad taste, visible damage, or pain when biting. A quick exam can pinpoint the cause and prevent a small issue from becoming a bigger one.
