White or Silver Fillings? A Practical Guide to Choosing the Right Option in London

One of the most common questions patients ask is whether they should choose white or silver fillings — or whether existing silver fillings should be replaced. It is a perfectly reasonable question, and one that deserves a clear, balanced answer.

Both white and silver fillings are well-established materials used to restore teeth after decay or damage. Each has strengths, and the most appropriate option depends on clinical factors such as the size and location of the cavity, the condition of the tooth, and the patient's overall dental health.

At our dental clinic in London, we help patients understand the differences between filling materials so they can make informed choices in partnership with their dentist. This guide explains what silver and white fillings are, how they compare, and when replacement may be worth considering.

What Are Silver (Amalgam) Fillings?

Silver fillings — more accurately known as dental amalgam — have been used in dentistry for well over a century. Amalgam is a mixture of metals including silver, tin, copper, and mercury, combined in a form that has long been considered durable and reliable for restoring decayed teeth.

Amalgam fillings were traditionally favoured because of their strength. They can withstand the considerable biting forces generated by the back teeth, making them a practical choice for larger cavities in molars and premolars.

Another advantage of amalgam is its track record. Many patients still have amalgam fillings placed decades ago that continue to function well. In clinical terms, amalgam has been a dependable and well-studied material.

However, amalgam fillings do not bond to the tooth structure. Instead, they rely on mechanical retention — meaning the dentist must shape the cavity in a specific way to hold the filling in place. This can sometimes require the removal of more natural tooth structure than would otherwise be necessary.

What Are White (Composite) Fillings?

White fillings are made from a composite resin — a tooth-coloured material that can be closely matched to the shade of the surrounding natural tooth. Composite has become increasingly popular in modern dentistry, both for its functional properties and its natural-looking appearance.

One of the key advantages of composite is that it bonds directly to the tooth structure. This adhesive bond means that less natural tooth needs to be removed during preparation, which can help preserve the long-term integrity of the tooth.

White fillings are suitable for a wide range of cavities, from small areas of decay on front teeth to moderate restorations on back teeth. They are placed in layers, with each layer hardened using a curing light before the next is applied.

While composite materials have improved significantly over the years, it is worth noting that their suitability depends on the size and location of the cavity, the forces the tooth is subject to, and the overall clinical picture. Your dentist will assess whether composite is the most appropriate material for your situation.

White Fillings vs Silver Fillings – Key Differences

Both materials are effective for restoring teeth, but there are several practical differences worth understanding:

Should Silver Fillings Be Replaced?

This is one of the most frequently asked questions in general dentistry. The short answer is: it depends on the clinical condition of the filling and the tooth.

Silver fillings that remain intact, well-sealed, and free from signs of deterioration do not necessarily need to be replaced. A filling that is functioning well and protecting the tooth may be best left in place — even if it does not match the tooth colour.

However, there are situations where replacement may be advised:

• The filling is cracked, fractured, or has begun to lift away from the tooth
• New decay has developed around or underneath the existing filling
• The filling has corroded or is no longer sealing the tooth effectively
• Part of the surrounding tooth structure has weakened or broken
• The patient is experiencing sensitivity or discomfort in the area

It is important to understand that replacing a filling purely for cosmetic reasons — without any clinical justification — may not always be in the best interest of the tooth. Removing an existing filling involves drilling, which can further reduce the remaining tooth structure. This is why the decision should always be guided by a thorough clinical assessment.

Benefits and Limitations of White Fillings

White fillings offer several advantages that make them a popular choice for many patients and dentists alike. However, they are not universally suitable for every situation.

The decision between white and silver fillings should be based on clinical suitability, not solely on appearance. Your dentist will consider factors such as the size of the cavity, the tooth involved, your bite, and your overall oral health when recommending the most appropriate material.

Are There Any Risks in Replacing Old Fillings?

While replacing a filling is a routine procedure, it is important to understand that it is not entirely without consideration. When an old filling is removed, additional tooth structure may be lost in the process — particularly if the existing filling is large or if decay is found underneath.

In some cases, removing a large amalgam filling may reveal that the remaining tooth is weaker than expected. If this happens, a simple filling replacement may not be sufficient, and a more protective restoration — such as a dental crown — may be recommended instead.

There is also a small risk of increased sensitivity following any filling procedure, although this typically settles within a few weeks. In rare cases, the nerve of the tooth may be affected, particularly if the cavity is deep or close to the pulp.

This is why a thorough clinical assessment is essential before deciding to replace any filling. Your dentist will evaluate the condition of both the filling and the surrounding tooth to determine whether replacement is appropriate and what material would be most suitable.

When to Speak to a Dentist About Your Fillings

If you have existing fillings — whether silver or white — it is important to attend regular dental examinations so your dentist can monitor their condition over time. Some signs that a filling may need attention include:

• Visible cracks or chips in the filling material
• A rough or uneven surface that catches when you run your tongue over it
• Sensitivity to hot, cold, or sweet foods and drinks
• Pain or discomfort when biting down
• A darkened area around the edge of the filling, which may suggest new decay
• A filling that feels loose or has partially come away from the tooth

Even if you are not experiencing symptoms, it is worth discussing your fillings with your dentist during your routine check-up. Some changes in fillings are subtle and may only be detected through clinical examination or dental X-rays.

If you are simply curious about whether your silver fillings could be replaced with white ones, your dentist can assess each filling individually and advise on whether replacement would be appropriate for your specific situation.

Booking a Dental Assessment in London

Whether you are concerned about an existing filling, interested in understanding your options, or simply due for a routine check-up, a dental assessment is the best starting point. Your dentist will examine the condition of your teeth and any existing restorations, discuss your concerns, and recommend a course of action based on your individual clinical needs.

At our practice, we take a careful, assessment-led approach to all restorative decisions. We believe patients deserve honest, balanced advice — and we will never recommend replacing a filling unless there is a genuine clinical reason to do so.

If you would like to discuss your fillings or book a dental consultation in London, our team is here to help. You can also view our dental fees for more information about treatment costs.

Your fillings are an important part of your dental health — and understanding your options is the first step towards making confident, well-informed decisions about your care.