Lost Filling or Crown — What to Do and When to See a Dentist

You are eating lunch, and suddenly there is something hard in your food that should not be there. A filling has come loose. Or you bite into a piece of toast and feel your crown lift away from the tooth underneath. It is an unsettling feeling — and an incredibly common one.

Lost fillings and dislodged crowns are among the most frequent dental concerns we see at Compass Dental in Darwin. The good news is that in most cases this is an urgent but manageable situation, not a true after-hours emergency. With the right immediate steps and a timely dental appointment, the tooth can usually be restored without complication.

This guide walks you through exactly what to do, what to avoid, and when to call us.

Why Fillings and Crowns Come Loose

Understanding why a filling or crown has come out can help you prevent it from happening again.

Fillings

• Normal wear over time. Fillings do not last forever. Amalgam (silver) fillings typically last 10 to 15 years, and composite (white) fillings around 5 to 10 years, depending on their size and location. Over time, the bond between the filling and the tooth can weaken.
• Decay forming underneath or around the filling. New decay can develop at the margins where the filling meets the tooth, undermining the seal.
• Biting forces. Grinding, clenching, or consistently chewing hard foods can place excessive stress on fillings, especially large ones.
• Changes in the tooth structure. Teeth flex slightly under load. Over years, this micro-movement can gradually loosen a filling.

Crowns

• Cement failure. The dental cement that bonds the crown to the prepared tooth can break down over time, particularly if saliva or food debris compromises the seal.
• Decay underneath. If decay develops on the tooth underneath the crown, it can undermine the fit and cause the crown to loosen.
• Eating sticky or hard foods. Toffees, caramels, hard lollies, and chewy snacks are common culprits.
• Grinding or clenching. Chronic bruxism places significant lateral forces on crowns and can gradually work them loose.
• Trauma. A knock to the face or biting on an unexpected hard object.

What to Do Right Now

If a Filling Has Fallen Out

1. Remove any loose pieces from your mouth. Spit them out carefully to avoid swallowing or inhaling fragments.
2. Rinse gently with warm salt water. Dissolve half a teaspoon of salt in a glass of warm water and swish gently to clean the cavity and remove any food debris. This also helps soothe the area and reduce bacteria.
3. Avoid chewing on that side. The exposed cavity is vulnerable to further damage, pressure sensitivity, and food getting packed in.
4. Apply a temporary filling material. Temporary dental cement is available from most pharmacies without a prescription (look for brands like Dentemp or similar). Follow the product instructions to fill the cavity temporarily. This protects the exposed tooth structure and reduces sensitivity.
5. If you do not have dental cement, a small piece of sugar-free chewing gum can be pressed gently into the cavity as a very short-term cover. This is not ideal, but it provides a physical barrier until you can get dental cement or see your dentist.
6. Manage any pain. If the tooth is sensitive, over-the-counter pain relief such as ibuprofen or paracetamol can help. Avoid very hot, cold, or sweet foods and drinks, which are likely to trigger sensitivity.
7. Call Compass Dental. Let us know that a filling has come out and we will arrange an appointment. If you are in significant pain or the tooth feels sharp or broken, let us know so we can prioritise your visit.

If a Crown Has Come Off

1. Find the crown and keep it safe. Check your food, your mouth, and the area around you. If you have swallowed it, do not panic — it will almost always pass through your system without any problems. Let your dentist know.
2. Examine the crown. Look inside it. If it is intact (hollow inside, no cracks, no large chunks of tooth stuck inside), there is a good chance it can be re-cemented.
3. Clean the crown gently. Rinse it under running water to remove any food debris. You can use a soft toothbrush to clean inside it, but do not scrub aggressively.
4. Try placing it back on the tooth temporarily. If the crown fits back over the tooth stump, you can use a small amount of temporary dental cement (from the pharmacy) or denture adhesive paste to hold it in place. Apply a thin layer inside the crown, seat it over the tooth, and bite down gently to check it sits correctly.
5. Do not use superglue or household adhesive. More on this below.
6. If you cannot get it to stay on, store the crown safely in a small container or zip-lock bag and bring it to your appointment.
7. Be gentle with the exposed tooth. The tooth underneath a crown has been reshaped and is much smaller and more vulnerable than a normal tooth. Avoid chewing on it, and stick to soft foods on the opposite side.
8. Call Compass Dental. We will see you as soon as possible to re-cement the crown or discuss replacement options.

What NOT to Do

In the moment, it can be tempting to improvise. Here are the most important things to avoid.

Do Not Use Superglue

This is the most common mistake. Superglue (cyanoacrylate adhesive) is not food-safe, can irritate or burn soft tissue, creates a bond that interferes with proper dental cement, and can make it significantly harder for your dentist to treat the tooth properly. It may seem like a quick fix, but it creates bigger problems down the track.

Do Not Ignore It

A missing filling or crown leaves the underlying tooth exposed. Without its protective covering, the tooth is vulnerable to:

• Further decay. Bacteria can access the exposed dentine and any previously sealed areas.
• Sensitivity and pain. The dentine layer contains microscopic tubules that connect to the nerve. Without the filling or crown acting as a barrier, hot, cold, sweet, and acidic stimuli can reach the nerve directly.
• Fracture. A tooth that has lost a large filling or crown is structurally weakened. Normal biting forces can cause it to crack or break further.
• Infection. If decay progresses to the nerve, infection and abscess can develop.

What starts as a re-cemented crown or a replacement filling can become a root canal, a new crown, or even an extraction if left too long.

Do Not Chew on the Affected Side

The exposed tooth is weakened. Biting forces that were previously distributed through the filling or crown are now concentrated on the remaining tooth structure, increasing the risk of fracture.

Do Not Place Aspirin on the Gum

This is an old remedy that does more harm than good. Aspirin is acidic and will cause a chemical burn to the gum tissue. If you need pain relief, swallow it as directed.

Is This an Emergency?

A lost filling or crown is urgent but usually not a true after-hours emergency. Here is how to gauge the situation.

See Your Dentist Within 1 to 2 Days If:

• The filling or crown has come out but you are not in significant pain
• You have applied temporary dental cement and the tooth feels comfortable
• There is no swelling, fever, or signs of infection
• The tooth is intact underneath — nothing appears broken

This is the most common scenario. Call Compass Dental and we will fit you in promptly.

See Your Dentist the Same Day If:

• You are experiencing significant pain that is not controlled by over-the-counter medication
• The tooth underneath looks broken or has sharp edges
• There is visible decay (dark or soft area) on the exposed tooth
• The tooth is sensitive to the point where eating and drinking are difficult

Go to the Emergency Department If:

• You have significant facial swelling, a high fever, or difficulty swallowing — these may indicate a spreading infection that needs immediate medical attention
• You have sustained trauma to the face or jaw in addition to losing the crown

What Happens at Your Dental Appointment

When you come to Compass Dental with a lost filling or crown, here is what to expect.

Assessment

Dr Thien Pham will examine the tooth, take X-rays if needed, and assess the condition of the remaining tooth structure. If you have the crown, Dr Pham will check whether it is still in good condition and fits properly.

Re-Cementing a Crown

If the crown is intact and the tooth underneath is healthy, re-cementing is often straightforward. Dr Pham will clean both the crown and the tooth, apply fresh dental cement, seat the crown, and check your bite. This can often be completed in a single, short appointment.

Replacing a Filling

If a filling has come out, the treatment depends on why it failed and what the tooth looks like now:

• Simple replacement. If the cavity is clean and there is no new decay, a new filling can be placed directly.
• Decay removal and larger filling. If new decay has developed, it will be removed first. The cavity may be larger than before, requiring a bigger filling.
• Crown. If the tooth has lost a large amount of structure — either from the original cavity, new decay, or fracture — a filling may no longer provide adequate protection. A crown may be recommended instead.

If the Crown Cannot Be Re-Cemented

Sometimes a crown cannot simply be glued back on:

• Significant decay underneath. The decay must be removed first. Depending on how much tooth structure remains, the tooth may need to be built up before a new crown is fabricated.
• The crown is damaged. If the crown is cracked, worn through, or no longer fits, a new crown will need to be made.
• The tooth is fractured. If the underlying tooth has broken, the treatment will depend on the extent of the fracture — this may involve a new crown, root canal treatment, or in severe cases, extraction.

Sedation Options

If you are feeling anxious about the appointment, Compass Dental offers happy gas (nitrous oxide) sedation to help you feel calm and comfortable during treatment. Combined with local anaesthetic, this ensures a gentle and pain-free experience.

Prevention — Keeping Your Fillings and Crowns in Place

While fillings and crowns will not last forever, there are steps you can take to maximise their lifespan.

• Attend regular dental check-ups. Dr Pham can identify early signs of failing fillings and crowns — such as marginal gaps, early decay, or cement breakdown — and replace them proactively before they fall out at an inconvenient time.
• Avoid hard and sticky foods on heavily restored teeth. Ice, hard lollies, toffees, and chewy caramels are common causes of lost restorations.
• Wear a night guard if you grind. Chronic grinding places enormous forces on fillings and crowns. A custom night guard protects your restorations while you sleep.
• Do not use your teeth as tools. Opening bottles, tearing packaging, and biting non-food objects put unnecessary stress on dental work.
• Maintain good oral hygiene. Brushing twice daily with fluoride toothpaste, flossing, and using interdental brushes around crowns helps prevent the decay that undermines restorations.

Patients from Regional and Remote NT

If you are travelling from Katherine, Alice Springs, Nhulunbuy, Tennant Creek, or other remote NT communities, we understand that getting to a dentist quickly may not be straightforward. Call us when the filling or crown comes out, and we can advise you on temporary measures to protect the tooth until you are able to get to Darwin. We accommodate patients from across the Northern Territory and will work with you to arrange a timely appointment.

Frequently Asked Questions

Can I eat normally with a temporary filling?

You can eat, but be cautious. Stick to soft foods and avoid chewing directly on the temporary filling. Temporary dental cements are not as strong as permanent restorations and can dislodge with sticky or hard foods.

How long can I wait before seeing a dentist?

Ideally, you should see your dentist within a few days. The longer the tooth is left exposed, the greater the risk of further decay, sensitivity, and fracture. If you are in pain, seek same-day care.

What if I swallowed my crown?

This is more common than you might think and is rarely a cause for concern. The crown will usually pass through your digestive system within a few days. Let your dentist know — a new crown will likely need to be made.

Can the same crown be put back on?

In many cases, yes. If the crown is intact and the underlying tooth is healthy, it can be cleaned and re-cemented. However, if there is decay underneath, the crown is damaged, or the fit has been compromised, a new crown may be necessary.

Why does the tooth feel so sensitive without the filling or crown?

When a filling or crown is removed, the dentine layer is exposed. Dentine contains thousands of microscopic tubules that connect to the nerve. Without the protective barrier of the restoration, stimuli such as temperature, air, and sweet foods can reach the nerve directly, causing sharp sensitivity.

Is a lost filling covered by dental insurance?

Most private health insurance policies with extras cover include fillings and crowns, though the level of cover varies. Check with your insurer for details. At Compass Dental, we can process your health fund claim on the spot.

Do Not Wait — Call Compass Dental

A lost filling or crown might not feel like an emergency, but the longer you leave it, the more likely you are to develop complications that require more extensive — and more costly — treatment.

At Compass Dental, we prioritise patients with urgent dental needs and will make room to see you. Dr Thien Pham and our team have been caring for Darwin patients for over 10 years, and we will have your tooth protected and comfortable as quickly as possible.

Call Compass Dental now or book an appointment online.