You’re enjoying a hot cup of coffee or a cold scoop of ice cream — and suddenly, there it is: a sharp zing in your tooth that stops you mid-bite. Tooth sensitivity might seem like a small annoyance, but it could be a sign that something deeper is going on.
The good news? It’s often treatable. But to fix it, you first need to understand what your mouth is trying to tell you. Whether it’s a new issue or something that’s gradually gotten worse, it’s worth getting a professional opinion. A visit to a trusted dentist Campsie locals rely on can help identify the root cause early and prevent further discomfort.
Let’s explore some of the most common reasons behind sudden sensitivity — and what you can do about them.
Worn Tooth Enamel
Your teeth are protected by enamel — a strong outer layer that shields the more sensitive inner layers. Over time, enamel can wear down from brushing too hard, acidic foods and drinks, or grinding your teeth at night.
Once enamel is compromised, the nerve-rich dentin underneath becomes exposed, making your teeth much more reactive to temperature changes and even sweet or sour foods.
What you can do:
- Use a soft-bristled toothbrush and brush gently
- Switch to a toothpaste designed for sensitive teeth
- Limit acidic foods and drinks like citrus, soda, and wine
- Talk to your dentist about a nightguard if you grind your teeth
Gum Recession
When gums pull back from the tooth’s surface, they expose the root — which isn’t protected by enamel. This is another common cause of tooth sensitivity, especially in adults.
Gum recession can happen due to gum disease, overbrushing, or simply aging. The roots of your teeth contain tiny tubules that lead directly to the nerve center — making any exposure feel extra sensitive.
How to spot it: You may notice your teeth look longer, or you can see a notch near the gumline.
Next steps: Your dentist may recommend desensitizing treatments, gum grafting, or improved oral hygiene practices depending on the severity.
A Cracked or Chipped Tooth
Even a tiny crack in your tooth can cause significant discomfort, especially when it exposes the inner layers. Sensitivity in one specific area — rather than several teeth — can be a clue that there’s structural damage.
Cracks may happen from chewing hard foods, grinding, or simply from wear over time.
What to do: Don’t wait. Cracks can worsen and lead to infection if left untreated. See your dentist for an exam and possible treatments like bonding, a crown, or in more serious cases, a root canal.
Tooth Decay or Cavities
A cavity starts small but can grow into a major problem if ignored. When decay breaks through enamel and reaches the inner dentin, it can cause pain and sensitivity — especially when exposed to heat, cold, or sugary foods.
Even if it doesn’t hurt yet, sensitivity can be an early warning sign.
Solution: The earlier you treat a cavity, the easier (and cheaper) it is to fix. A simple filling may be all that’s needed.
Recent Dental Work
If you’ve recently had a filling, crown, or whitening treatment, some temporary sensitivity is normal. It usually fades within a few days, but it can be surprising if you weren’t expecting it.
When to worry: If the sensitivity lasts longer than a week or worsens, it’s worth checking back in with your dentist. There may be an issue with the fit of a crown, or your tooth may be reacting to changes in pressure or materials used.
Sinus Pressure or Infection
Believe it or not, not all tooth pain starts in the mouth. Your upper teeth share space with your sinuses, and inflammation in that area — like from a cold or sinus infection — can cause pressure that mimics tooth pain or sensitivity.
Tip: If multiple upper teeth feel sensitive and you’re also congested or have facial pressure, this could be the cause. If symptoms persist, see both your doctor and your dentist to rule things out.
Tooth sensitivity isn’t something you should just “live with.” While it’s common, it’s also your body’s way of signaling that something needs attention. Even if the pain comes and goes, it’s better to get it checked before it becomes something more serious.
If you’ve noticed changes in your teeth — especially sudden or worsening sensitivity — booking a check-up with your local dentist is a smart move. Catching the issue early could save you time, money, and unnecessary discomfort down the line.
