That sudden sharp twinge when cold, hot, sweet, or even cold air reaches a tooth is one of the most common complaints I hear. Tooth sensitivity is usually manageable once you understand what's causing it, so let's look at why it happens and what actually helps.
What's happening when a tooth is sensitive
Under your enamel lies a layer called dentine, which contains tiny tubes leading to the nerve inside the tooth. When enamel wears thin or the gum recedes and exposes the root, those tubes are more open to the outside world. Hot, cold, and sweet stimuli can then reach the nerve more easily, producing that characteristic quick, sharp pain.
Common causes
Sensitivity has several typical drivers, often in combination:
- Brushing too hard or with a hard brush, which wears enamel and pushes gums back.
- Gum recession that exposes the softer root surface.
- Acid erosion from acidic food and drink thinning the enamel.
- Teeth grinding, which wears the biting surfaces.
- Tooth decay, a cracked tooth, or a worn filling in specific spots.
The everyday fixes worth trying first
For general sensitivity, some simple changes often help. Switching to a soft-bristled brush and easing off the pressure protects enamel and gums. Desensitising toothpastes, used regularly over a few weeks, can genuinely reduce sensitivity by blocking those tiny tubes. Cutting back on acidic food and drink, and not brushing straight after acid exposure, helps too.
When sensitivity points to something specific
General sensitivity across several teeth is different from a single tooth that's suddenly become very sensitive or painful. Sensitivity concentrated in one spot, especially if it lingers, throbs, or comes with pain on biting, can indicate decay, a crack, or a filling problem that needs treatment. That's a reason to get it looked at rather than just reaching for special toothpaste.
Treatments your dentist can offer
If home measures aren't enough, there are in-practice options. These can include applying fluoride treatments or sealants to strengthen and protect exposed areas, bonding to cover exposed roots, or addressing the underlying cause if it's decay, a crack, or gum recession. The right approach depends on why your teeth are sensitive in the first place.
Don't just live with it
A lot of people put up with sensitivity for years, assuming it's just how their teeth are. Often it's very treatable, and sometimes it's a warning sign of something worth catching early. If cold or hot foods are making you wince regularly, it's worth mentioning at your next visit so we can work out what's behind it.