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Dental Expert

Tooth-coloured Fillings vs. Traditional Fillings: What Your Dentist Won’t Tell You About Temperature Sensitivity

By Dr Manish Shah | Registered Dental Practitioner | Registered Medical Practitioner
17 Nov 2025

Table of Contents

Ever wince when sipping your morning coffee? Or maybe ice cream sends a sharp jolt through your tooth? Yeah, that might be your filling. Most dentists explain the basics about filling materials, but here’s the thing: the conversation about temperature sensitivity often gets brushed aside. Sometimes skipped entirely. Not all fillings handle hot and cold the same way. 

This difference? It can seriously mess with how comfortable you feel every single day. Understanding how different materials respond to temperature could completely reshape how you think about your next dental visit. In this blog, we’ll look at why some materials conduct temperature better than others, what that means for your daily comfort, and the facts you should know before sitting in that dental chair again.

Temperature Conductivity

So here’s what happens with traditional silver amalgam fillings. They’re made of metal alloys that conduct heat way more efficiently than your natural tooth enamel. You drink something hot or cold, and these metal fillings? They basically create a highway for temperature straight into your tooth.

Tooth-coloured fillings on the other hand are normally made of composite resins or ceramic materials. These materials have a much lower thermal conductivity than metal. Think of tooth-coloured fillings like insulators. They create a barrier protecting the sensitive inner parts of your tooth from temperature extremes.

Expert dentists providing tooth coloured fillings in Sydney attach these fillings directly to your tooth, adding extra insulation. These restorations stop breakage while protecting your tooth from wild temperature swings. Strength and thermal protection? You get both with these fillings.

Expansion and Contraction Issues

There is one more issue with metal amalgam fillings. They do not only conduct heat; they grow and shrink with changes in temperature. Imagine the following: you take a hot coffee. The tooth is surrounding a metal filling that expands at a faster rate than the tooth. Pressure goes right on your tooth nerve. Cold beverages? Opposite effect. The metal contracts quickly, creating a pulling sensation that hurts just as much.

What happens with metal fillings:

  • Volume changes rapidly with temperature extremes
  • Expansion stresses the surrounding tooth
  • Contraction creates pulling forces irritating nerve endings
  • Repeated cycles cause tiny cracks called microfractures

Tooth-coloured fillings don’t have this issue. Their thermal expansion rate matches natural tooth material much more closely.

Post-Procedure Sensitivity Comparison

Both types of fillings can make your teeth sensitive right after the procedure. How long does that last? Varies quite a bit. Tooth-coloured restorations might cause some sensitivity to hot and cold at first. Usually fades within days. The composite material does not change length with temperature variations and therefore you are less likely to experience discomfort during the actual process.

Amalgam fillings made of metals are more likely to be associated with the appearance of sensitivity during the first several days. Why? Metal conducts temperature extremely well. Amalgam is able to expand and contract depending on the change in temperatures. You may also have the problem of constant discomfort when the filling compresses against your tooth. The tooth pain/sensitivity post-filling is to be expected and will get better in a few days or it might even take up to a couple of weeks, although the degree of pain will differ according to the type of filling.

Long-Term Protection Benefits

Amalgam fillings need dentists to remove healthy tooth structure just to make them stay in place. Tooth-coloured fillings? They actually stick to your tooth. That adhesive connection creates a seal. Temperature changes can’t reach the sensitive layers inside your tooth.

Cavity liners and tooth-coloured materials provide solid protection against thermal stress. Matters especially if you love really hot coffee or ice-cold drinks. At Smile Concepts we carefully match composite resin or porcelain shade to your natural tooth colour. Plus, we make sure you get the best thermal protection for long-term comfort.

Making the Right Choice

When deciding between filling options, temperature sensitivity should factor into your choice. Modern composite restorations insulate better than traditional amalgam. The materials used in these fillings look natural AND make eating and drinking more comfortable.

At Smile Concepts, good dental care goes beyond just fixing cavities. Our composite fillings help prevent tooth breakage. They protect against excessive temperature changes. Strength and comfort? We tackle both. We offer flexible payment options as our aim is to ensure that quality dental care stays within reach for everyone.

Your Path Forward

Temperature sensitivity shouldn’t dictate what you eat or drink. How do different filling materials handle heat and cold? Understanding this puts you in control of your dental decisions. Modern composite restorations give you natural-looking results. Plus functional benefits that seriously reduce or eliminate temperature discomfort. Getting new cavities filled? Thinking about replacing those old amalgam fillings? Composite options deliver aesthetics and comfort together.

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Frequently Asked Questions

Yes, composite fillings have a superior insulating effect to that of metal amalgam, lowering heat and cold conduction to nerves in the teeth.

Temporary sensitivity normally disappears in a few days or two weeks following the procedure.

Yes, it is safe to remove the existing amalgam fillings and be able to replace them with composite fillings in order to have better aesthetics and comfort.

No, composite materials have thermal expansion rates closer to natural tooth structure, minimizing pressure on nerves.

Smile Concepts is a high-end dental clinic in the heart of Sydney. To deliver the best service, we always prioritise your wellbeing so we can use our expertise to help you live a better life.

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Dr Manish Shah

Dr. Manish Shah is a cosmetic dentist with a special interest in porcelain veneers, dental implants and Invisalign in Sydney. 

Dr Kinnar Shah
BDS (Gla)

Dr. Kinnar Shah is a cosmetic dentist with a special interest in cometic dentistry, porcelain veneers and dental implants practising at Smile Concepts.