What Is a Knocked-Out Tooth?

A knocked-out tooth is a completely displaced tooth that has fallen out of its socket due to dental trauma. Dental professionals refer to this condition as an avulsed tooth. This injury is a time-critical dental emergency where every minute dictates the survival of the tooth.

A knocked-out adult tooth requires immediate action to preserve the delicate cells on the root. An avulsed tooth differs from other dental injuries. A luxated tooth remains in the socket but loosens or moves out of position. A fractured tooth breaks, leaving the root in the jaw. An avulsed tooth completely leaves the alveolar socket.

The periodontal ligament connects the tooth root to the alveolar bone of the jaw. When a tooth experiences avulsion, this ligament tears completely. The cells on the surface of the root, known as cementoblasts, die rapidly when exposed to air, dry environments, or incorrect temperatures. According to the Australian Dental Association (ADA) guidelines on dental avulsion management, preserving these delicate cells is the primary goal of first aid. If the cementoblasts survive, the tooth will reattach to the bone. If they die, the body treats the root as a foreign object and slowly dissolves it through a process called resorption.

Common causes of a tooth knocked out include contact sports injuries, falls, bicycle accidents, and physical altercations. Adults and children in Ferny Hills, Ferny Grove, Everton Park, Everton Hills, Gaythorne, Keperra, Arana Hills, and Upper Kedron experience these traumas frequently. Recognising the severity of a knocked out adult tooth ensures patients take immediate corrective action.

What Should You Do Immediately If a Tooth Is Knocked Out?

To save a knocked-out tooth, you must follow a strict 5-step emergency protocol within 30 minutes. Acting fast protects the root cells and increases the chance of successful tooth reimplantation.

1. Find the tooth immediately. Locate the missing tooth on the ground or floor. Handle the situation calmly to avoid stepping on or losing the tooth.
2. Pick it up by the white top part (the crown). Never touch the yellow root. Touching the root damages the microscopic periodontal ligament cells required for healing.
3. If the tooth is dirty, rinse it gently with milk or the injured person’s saliva for 10 seconds. Do not scrub the root. Do not use tap water. The chemicals and mineral content in tap water destroy root cells instantly through osmosis.
4. Push the tooth back into the socket immediately if it belongs to an adult. Position the tooth over the empty socket and apply gentle, steady downward pressure until it sits level with the adjacent teeth. Bite down gently on a clean cloth, handkerchief, or gauze to hold the tooth in place.
5. Call Ferny Hills Dental on (07) 3351 2731 immediately. Inform the receptionist that you need help with a knocked out tooth what to do. The clinic prioritises emergency dental care to accommodate immediate trauma cases.

The 30-minute golden window determines if the tooth survives. Time directly impacts cell viability on the root surface. If the tooth remains dry for longer than 60 minutes, the root cells die completely.

How Do You Transport a Knocked-Out Tooth?

You must transport a knocked-out tooth safely to the dentist if you cannot reimplant it into the socket. Proper storage prevents root cells from dying by maintaining the correct pH and osmotic pressure.

The best storage options include:

• Placing the tooth in a small container of cold milk. Milk provides an ideal environment because its pH matches the conditions inside the mouth. The nutrients in milk sustain the periodontal ligament cells temporarily.
• Tucking the tooth inside the cheek between the gum and cheek if the patient is a conscious adult. Saliva provides a natural protective fluid that keeps the root moist. Do not use this method if the patient risks swallowing the tooth.
• Submerging the tooth in a saline solution. Contact lens saline or sterile wound wash provides a temporary medium.
• Keeping the tooth in a container filled with the patient’s saliva. Spit into a small cup and drop the tooth inside.

Never store a knocked-out tooth in water. Water causes the cells on the root to swell and burst due to osmotic differences. Water destroys the attachment mechanism required for healing.

Never wrap the tooth in tissue, paper towel, or cloth. Fabric absorbs moisture and dries out the root within minutes. A dry root guarantees reimplantation failure.

Bring the tooth to the dentist within 30 minutes for the highest chance of successful tooth reimplantation. If transport takes longer, milk remains the most reliable storage medium for up to two hours.

How Is a Knocked-Out Tooth Treated at the Dentist?

Dentists treat a knocked-out tooth by cleaning the socket, reinserting the tooth, and stabilising it. The clinical team at Ferny Hills Dental offers same-day emergency appointments for dental trauma. Our team brings together graduates of the University of Otago and University of Queensland with over 50 years of combined clinical experience.

During the procedure, the dentist numbs the gums and surrounding area with a local anaesthetic. The dentist then flushes debris and blood clots from the empty socket to create a clean environment. If you successfully reimplanted the tooth at home, the dentist verifies the positioning using a digital X-ray.

If the tooth requires reimplantation, the dentist carefully slides the root back into the socket. To stabilise the tooth, the dentist attaches a flexible splint across the avulsed tooth and the two adjacent teeth. This splint holds the tooth securely while the periodontal ligament heals. The splint remains in place for 2 to 8 weeks, depending on the severity of the bone damage.

Dentists prescribe antibiotics to prevent bacterial infection in the traumatised tissue. Because the nerve supply severs during avulsion, the internal pulp of the tooth dies. Patients usually need root canal therapy 7 to 10 days after the initial reimplantation. During this follow-up procedure, the dentist removes the dead nerve, disinfects the inside of the tooth, and seals the canals. The dentist takes follow-up X-rays at 4 to 6 weeks, 6 months, and 12 months to monitor healing and check for root resorption.

Dr Angela Yang (BDS Distinction, University of Otago 2006) leads the clinical team with extensive experience in dental trauma. This page was medically reviewed in July 2026 by Dr Yang, BDS (Distinction), University of Otago. Dr Rochelle Yong Gee, Dr Neil Haldar, Dr Jennifer Lee, and Dr Daniel Busch provide comprehensive urgent care. Our experienced dentists use modern digital imaging to assess the extent of the damage instantly.

What Is the Success Rate of Reimplanting a Tooth?

The success rate of reimplanting a tooth depends entirely on the time the tooth spends outside the socket. The conditions under which the tooth survived during avulsion also impact the outcome.

The time intervals for tooth survival include:

• Within 5 minutes: Excellent prognosis. The cells remain viable and attach immediately to the bone.
• Within 30 minutes: Good prognosis. Minor cell damage occurs, but the ligament still heals effectively.
• Within 60 minutes: Fair prognosis. Cell viability drops significantly, requiring longer healing times and intensive monitoring.
• Over 60 minutes: Poor prognosis. The cells die completely, and the body eventually rejects the root structure.

Teeth reimplanted within 30 minutes and stored in milk demonstrate a survival rate exceeding 90% at 5 years. The cool liquid preserves the cell walls long enough for the body to accept the tooth.

After 60 minutes of dry time, the periodontal ligament cells undergo necrosis. This cell death means the tooth fuses directly to the jawbone through a process called ankylosis. Over time, the immune system attacks the root material, leading to external inflammatory root resorption. The tooth becomes loose, develops infections, and eventually fails despite initial successful reimplantation.

What Happens If a Tooth Cannot Be Saved?

If a dentist cannot save a knocked-out tooth, you must replace the missing tooth to prevent functional and aesthetic complications. Leaving a gap causes the jawbone to deteriorate over time because the bone lacks stimulation from the tooth root. This process alters the shape of the face and causes the cheeks to sink inward.

Furthermore, teeth constantly seek opposing pressure. Without a counterpart, the tooth above or below the gap begins to over-erupt. The teeth adjacent to the gap tilt sideways into the empty space. This shifting creates hard-to-clean areas that trap food, leading to accelerated tooth decay and gum disease.

Patients have 3 primary tooth replacement options after an avulsed tooth fails or requires extraction:

1. Dental implants: This option acts as the gold standard for tooth replacement. A titanium post replaces the root, integrates with the bone, and supports a porcelain crown. An implant costs between $3,500 and $5,500. Implants prevent bone loss and function identically to natural teeth.
2. Dental bridges: A bridge anchors to the two teeth adjacent to the gap. These supporting teeth receive crowns, which hold the replacement tooth in the middle. Ferny Hills Dental crafts CEREC technology bridges in a single day using ceramic blocks. A bridge costs between $1,800 and $3,000.
3. Partial dentures: A removable acrylic or chrome cobalt frame replaces the missing tooth. This option offers a cost-effective solution for patients waiting for an implant or bridge. A partial denture costs between $600 and $1,500.

What Are the Costs of Knocked-Out Tooth Treatment?

The costs of knocked-out tooth treatment in Australia vary based on the clinical procedures required. Ferny Hills Dental provides transparent pricing and comprehensive treatment plans following initial assessment.

The table below outlines the expected costs for emergency trauma care:

Treatment Option	Estimated Cost Range	Clinical Purpose
Examination and X-ray	$80 – $150	Diagnose socket condition and rule out jaw fractures
Reimplantation and Splinting	$300 – $600	Re-secure the tooth into the alveolar socket
Root Canal Therapy	$900 – $1,600	Remove dead nerve tissue and prevent internal infection
Tooth Extraction	$250 – $500	Remove non-viable root fragments to prevent sepsis

If the dentist determines the tooth requires extraction because the root shattered, replacement costs apply. A dental implant costs between $3,500 and $5,500. A dental bridge costs between $1,800 and $3,000.

Ferny Hills Dental is a preferred provider for major Australian health funds. Patients with Bupa Members First or Medibank Members Choice cover receive reduced out-of-pocket costs for emergency treatments. We process health fund claims on the spot using HICAPS to minimise your financial stress during a crisis.

What Are the Differences Between Baby and Adult Teeth?

You must never reimplant a baby tooth. Reimplanting a baby tooth damages the developing adult tooth growing underneath the gum. The pressure of pushing a baby tooth back into the socket can dislodge or infect the permanent tooth bud.

If a child knocks out a baby tooth, you should control the bleeding by applying pressure with a clean cloth or gauze. Rinse the child’s mouth with warm water. Bring the child to Ferny Hills Dental immediately. The dentist will assess the socket, smooth any sharp bone edges, and ensure no root fragments remain trapped under the gum.

Only adult teeth require reimplantation. You can identify a knocked out adult tooth by its longer root and larger crown. Baby teeth feature shorter roots because the adult teeth absorb these roots during the natural shedding process. If you feel unsure whether the knocked-out tooth is an adult tooth or a baby tooth, bring it to the dentist for professional identification.

When Is a Knocked-Out Tooth a Dental Emergency?

A knocked-out tooth always constitutes a severe dental emergency. The survival of the tooth depends on receiving professional dental care within 60 minutes.

Patients in Ferny Hills, Ferny Grove, Everton Park, Everton Hills, Gaythorne, Keperra, Arana Hills, and Upper Kedron should call (07) 3351 2731 immediately. Ferny Hills Dental prioritises trauma cases and reserves same-day appointment slots for acute dental injuries. Our clinic operates Monday to Friday, with late appointments available on Wednesdays until 6pm.

Even if you successfully pushed the tooth back into the socket, you still require immediate professional care. The dentist must verify the alignment of the root, clean the area professionally, and apply a stabilising splint. Delaying treatment increases the risk of bacterial infection and permanent tooth loss.

How Can You Prevent Knocked-Out Teeth?

You can prevent knocked-out teeth by protecting your mouth during high-risk activities. Proactive dental care strengthens teeth against trauma.

You should follow these 6 preventative measures:

1. Wear a custom-fitted mouthguard during contact sports like rugby, football, hockey, and martial arts. A custom mouthguard from Ferny Hills Dental fits the exact topography of your teeth. Unlike over-the-counter boil-and-bite options that fit loosely, custom mouthguards provide uniform shock absorption. They prevent the lower jaw from slamming into the upper jaw during an impact.
2. Wear a seatbelt every time you travel in a motor vehicle to prevent facial impact against the dashboard during sudden stops.
3. Use a night splint if you grind your teeth during sleep. Grinding weakens the periodontal ligament over time, making teeth more susceptible to avulsion from minor impacts.
4. Childproof your home by securing rugs, padding sharp furniture corners, and installing safety gates at the top of stairs to prevent fall injuries.
5. Treat loose or decayed teeth before trauma occurs. Decay destroys the bone supporting the tooth, increasing the risk of tooth loss during physical activity.
6. Attend regular check-ups with our experienced dentists to maintain strong periodontal ligaments and healthy jawbone density. Detecting hairline cracks early prevents complete fractures during trauma.

Frequently Asked Questions

Can a knocked-out tooth be saved?
Yes, a knocked-out adult tooth can be saved if you act quickly. You must reimplant the tooth or store it in milk within 30 minutes. Time dictates cell survival on the root surface. You can find rapid assistance by arranging emergency dental care with our team.

How long do you have to save a knocked-out tooth?
You have a maximum of 60 minutes to save a knocked-out tooth. Dentists achieve the highest survival rates when the tooth returns to the socket within 30 minutes. After 60 minutes, the success rate drops significantly because the periodontal ligament cells die from oxygen deprivation.

Should you put a knocked-out tooth in water?
No, you should never put a knocked-out tooth in water. Water causes the cells on the root to swell and burst due to osmotic pressure. Tap water contains chlorine and minerals that destroy root cell viability instantly. Milk or saliva represent the only safe fluids.

Can you reimplant a baby tooth?
No, dentists never reimplant a baby tooth. Reimplanting a baby tooth can fuse to the bone through ankylosis. This fusion blocks the permanent adult tooth from erupting correctly and damages the developing enamel. Bring the child to the dentist to manage the bleeding and assess the socket.

How much does it cost to fix a knocked-out tooth?
Fixing a knocked-out tooth costs between $300 and $600 for reimplantation. If the tooth requires a root canal, the total cost rises to $1,200 to $2,200. If extraction is necessary, a tooth extraction costs $250 to $500, while a dental implant costs $3,500 to $5,500. Health funds often cover a portion of these emergency procedures.

What is the best liquid to store a knocked-out tooth in?
Milk is the best liquid to store a knocked-out tooth. Milk maintains the correct pH balance, contains nutrients that sustain cells, and lacks the damaging minerals found in water. Cold milk preserves the periodontal ligament cells for up to two hours. Saliva acts as the second best option if milk is unavailable.