Sensitive teeth: why it happens and how to get relief

Quick answer: what causes sensitive teeth?

Tooth sensitivity happens when the hard outer enamel or the gum that normally covers your tooth wears away, exposing the softer layer underneath called dentin. Dentin is full of tiny channels that lead straight to the nerve, so cold, heat, sweet, or acidic triggers reach the nerve and cause a quick, sharp twinge. The most common reasons that protective layer is lost are receding gums, enamel worn by aggressive brushing or grinding, acidic diets, a cracked tooth, a cavity, or a recent dental procedure.

The most common causes, explained

• Gum recession — when gums pull back, the root surface (which has no enamel) becomes exposed and sensitive
• Brushing too hard — a stiff brush and heavy pressure wear away enamel and push gums back
• Teeth grinding (bruxism) — clenching at night thins enamel and can crack teeth
• Acidic foods and drinks — citrus, pop, sports drinks, and wine soften enamel over time
• Cavities or worn fillings — decay or a leaking filling lets triggers reach the nerve
• Cracked or chipped teeth — even a hairline crack can cause sharp pain when biting or with cold
• Recent whitening or a new filling — usually temporary and settles within a few days

The American Dental Association has a helpful patient overview of tooth sensitivity if you want a second neutral source.

What you can do at home right now

For mild sensitivity, these steps often bring noticeable relief within a couple of weeks:

• Switch to a desensitizing toothpaste and use it twice a day — it works gradually, so give it time
• Use a soft-bristled brush and brush gently in small circles, not hard back-and-forth scrubbing
• Wait about 30 minutes after acidic food or drink before brushing, so you don't scrub softened enamel
• Cut back on pop, citrus, and sports drinks, or have them with a meal
• Pause whitening products until the sensitivity settles
• If you wake with jaw soreness or headaches, ask about a night guard for grinding

Good daily technique matters more than most people think — the Canadian Dental Association covers brushing and flossing the right way.

When sensitivity means you should see a dentist

Occasional, brief sensitivity is common. But some patterns are a signal that something needs treatment. Book a visit if you notice any of these:

• Sensitivity that lasts more than two to four weeks despite home care
• Sharp pain when biting down (a possible crack or high filling)
• Pain focused on one tooth rather than general sensitivity
• Sensitivity with a visible hole, dark spot, or chipped edge
• Lingering, throbbing, or spontaneous pain — or pain that wakes you up
• Swollen, bleeding, or receding gums around the sensitive area

If the pain is severe, constant, or comes with swelling, treat it as urgent — our guide on when tooth pain is a dental emergency explains what needs same-day care.

How a dentist treats sensitive teeth

The fix depends on the cause, which is exactly why an exam helps. Common treatments include:

• Fluoride application to strengthen enamel and calm the nerve response
• Tooth-coloured fillings or bonding to cover exposed root surfaces or repair worn areas
• Treating the underlying cavity or crack if decay or fracture is the source
• Gum treatment when recession or gum disease is exposing roots
• A custom night guard if grinding is wearing the teeth down

A regular checkup and cleaning is also one of the best ways to catch the small problems — early decay, a hairline crack, gum recession — before they turn into bigger, more painful (and more expensive) ones. This is the heart of preventive dentistry, and it is just as important for kids and teens, which is part of family dental care.

Don't just live with it

Many people put up with sensitive teeth for years, assuming it is normal. Often it is a sign of something simple and fixable — and treating it early keeps a small issue from becoming a root canal or extraction later. If your teeth twinge with cold, heat, or sweets, call (709) 466-7001 or book an appointment, and we will find the cause and the most comfortable way to fix it.