Tooth Sensitivity: Causes, Treatment, and When to See a Dentist

Cold water makes you wince. Ice cream is off the menu. If a sip of coffee sends a quick, sharp pain through a tooth, you are dealing with tooth sensitivity, and you are far from alone. It is one of the most common complaints we hear from patients across Toronto and the GTA, and it affects people at every age, not just those with obvious dental problems.

The good news is that sensitivity almost always has a clear, treatable cause. Once we find it, most patients get real relief within a visit or two, not months of guessing with different toothpastes.

What Causes Tooth Sensitivity?

Underneath your enamel sits a layer called dentin, packed with tiny tubules that lead straight to the nerve inside the tooth. When enamel wears thin or gums pull back and expose the root, those tubules are uncovered. Hot, cold, sweet, or even a rush of cold air can then trigger that quick jolt of pain.

A few things commonly cause it:

• Worn enamel from acidic foods and drinks, aggressive brushing, or years of wear

• Receding gums that expose the tooth root, often tied to gum disease

• A cavity, a cracked tooth, or a filling that has worn down or failed

• Teeth grinding, which wears down enamel over time, often while you sleep

• Recent dental work, like a cleaning, filling, or whitening treatment, which can cause short-term sensitivity that fades within a week or two

• Frequent acid reflux or vomiting, which exposes teeth to stomach acid

Most patients have more than one factor at play, which is why a cookie-cutter fix from the drugstore shelf does not always work. Figuring out which cause applies to you is the first step to actually solving it, rather than just masking the pain.

Home Care vs Professional Treatment: What Actually Works

Not every sensitive tooth needs the same fix. Here is how the common options compare, from something you can start tonight to a procedure done in our chair.

Treatment	Best For	Typical Cost	How Long Relief Lasts
Desensitizing toothpaste	Mild, diet-triggered sensitivity	$10 to $15	Ongoing, with daily use
In-office fluoride varnish	Early enamel wear or after whitening	$30 to $60 per visit	3 to 6 months
Bonding or sealant	Exposed root surfaces from gum recession	$150 to $350 per tooth	3 to 5 years
Night guard for grinding	Sensitivity caused by bruxism	$400 to $650	Several years, with care
Root canal treatment	Sensitivity from nerve damage or infection	Varies by tooth, typically $800+	Permanent for that tooth

If sensitivity is mild and shows up only around cold drinks or sweets, a good desensitizing toothpaste used consistently for two to four weeks often takes care of it. If it is tied to visible gum recession, a cracked filling, or grinding, home care alone will not fix the underlying problem, and it is worth having us take a look before it gets worse.

When Tooth Sensitivity Signals Something More Serious

Occasional twinges after cold food are normal. Sensitivity that is sudden, severe, or focused on a single tooth is different. It can point to a cracked tooth, a deep cavity, or decay reaching the nerve. If a tooth aches on its own without any trigger, throbs at night, or you notice swelling near the gum, do not wait it out. Left untreated, nerve involvement often leads to a root canal treatment to save the tooth, and waiting usually means a more complicated and more expensive fix later.

How We Diagnose and Treat Sensitivity at Lornview Dental

Mention any sensitivity at your next dental cleaning, even if it seems minor. We will check for the cause, look for gum recession, worn enamel, cracks, or decay, and take an X-ray if something needs a closer look. Most patients leave with a straightforward fix: a fluoride treatment, a small filling, or a change in brushing technique. We would rather catch this early, while the fix is simple, than wait until it turns into something that needs a root canal.

Preventing Tooth Sensitivity Long Term

A few habits go a long way toward keeping sensitivity from coming back, and most of them take less effort than what you are doing now to avoid cold drinks.

• Use a soft-bristled toothbrush and a gentle, circular motion rather than scrubbing

• Wait about 30 minutes after acidic food or drink before brushing, so you are not brushing softened enamel

• Switch to a fluoride toothpaste made for sensitive teeth

• Ask about a night guard if you grind your teeth

• Keep up with regular cleanings and checkups so we catch gum recession or wear early

Frequently Asked Questions

Is tooth sensitivity always a sign of a cavity?

Not always. It can also come from receding gums, worn enamel, or teeth grinding. A dental exam is the only way to know the actual cause and treat it correctly, rather than guessing from home.

Why are my teeth suddenly sensitive after a cleaning or whitening treatment?

Mild sensitivity after a cleaning or whitening treatment is common and usually fades within a week or two as your teeth and gums settle. If it lasts longer than that or gets worse, let us know so we can take a look.

Can I use whitening toothpaste if my teeth are already sensitive?

Whitening toothpaste can make sensitivity worse because of the abrasives and chemicals it uses to lift stains. Switch to a toothpaste made for sensitive teeth, and ask us about a professional whitening approach that is gentler on your enamel.

How long does tooth sensitivity usually last?

It depends on the cause. Temporary sensitivity from a cleaning or filling fades in a few days. Sensitivity from exposed roots or a cracked tooth will not go away on its own and needs treatment to actually resolve.

Sensitive teeth do not have to be something you just live with. Schedule an appointment with Lornview Dental and we will find the cause and get you comfortable again.