Tooth Sensitivity: Why Your Teeth React to Cold Weather (and Hot Drinks)

What is tooth sensitivity?

Tooth sensitivity (also called dentine hypersensitivity) happens when the protective outer layer of the tooth – enamel – or the gums no longer fully shield the inner layer, the dentine.

Dentine contains tiny channels that lead directly to the nerve of the tooth. When exposed to cold air, hot drinks, sweet foods or acidic items, these channels allow sensations to travel straight to the nerve, causing that familiar short, sharp pain.

Why cold weather makes sensitivity worse

Cold weather itself doesn’t damage teeth, but it can highlight existing issues.

1. Cold air and temperature changes

When you breathe in cold air, your teeth are suddenly exposed to a much lower temperature. If dentine is exposed, the nerve reacts quickly, leading to discomfort.

2. Hot and cold contrast

Winter often brings rapid temperature changes – stepping in from the cold and sipping something hot. Teeth naturally expand slightly with heat and contract with cold. Repeated expansion and contraction can aggravate sensitive areas, particularly if enamel is already worn or cracked.

3. Dry mouth

Cold weather, indoor heating and breathing through the mouth can all reduce saliva flow. Saliva plays an important role in protecting teeth, so a dry mouth can make sensitivity more noticeable.

Common causes of tooth sensitivity

Sensitivity isn’t a condition on its own – it’s usually a symptom of something else. Common causes include:

• Worn enamel from acidic foods, fizzy drinks or aggressive brushing
• Receding gums, which expose the root surface of the tooth
• Tooth grinding (bruxism), often linked to stress
• Cracked or chipped teeth
• Recent dental treatment, such as whitening or fillings
• Gum disease, which can expose sensitive areas over time

If sensitivity is persistent or worsening, it’s important not to ignore it.

What you can do at home

There are several simple steps that can significantly reduce discomfort:

• Use a toothpaste for sensitive teeth. These help block the pathways to the nerve over time
• Brush gently with a soft-bristled toothbrush. Scrubbing harder won’t clean better and can make things worse
• Avoid brushing immediately after acidic foods or drinks – wait at least 30 minutes
• Limit very hot and very cold foods if they trigger discomfort
• Wear a scarf over your mouth outdoors in very cold weather to reduce cold air hitting your teeth

Consistency is key – sensitivity toothpastes, in particular, need regular use to be effective.

How your dentist can help

If those steps aren’t enough, we can help identify and treat the underlying cause. Depending on what we find, treatment may include:

• Professional fluoride applications to strengthen enamel
• Desensitising treatments applied in surgery
• Advice on brushing technique and products
• Treating gum disease or receding gums
• Repairing cracks, worn fillings or damaged teeth
• A custom-made night guard if grinding is contributing to the problem

We always take a gentle, preventative approach and explain everything clearly, so you feel confident in your care.

Don’t ignore ongoing sensitivity

Occasional mild sensitivity can be normal, especially in cold weather. However, pain that lingers, worsens, or affects one specific tooth could indicate a deeper issue such as decay or a crack.

Early assessment usually means simpler, more comfortable treatment and less disruption for you.

We’re here to help

If cold weather, hot drinks or temperature changes are making your teeth uncomfortable, don’t just put up with it. At Holland Park Dental Centre, we’re here to identify the cause and stop you feeling pain when you step outside or reach for a warm drink.

If you have questions about tooth sensitivity or would like to book an appointment, please get in touch with our friendly team. We’re always happy to help.