Not every knocked tooth is knocked out. A large share of dental trauma involves a tooth that is jarred, tender or slightly loose but still sitting in its normal position. In trauma terms these are the two mildest luxation injuries: concussion, where the tooth is tender but not loosened, and subluxation, where the tooth is loosened but not displaced. They are common after sport, falls and minor collisions, and the good news is that most teeth with these injuries recover with careful monitoring rather than major treatment.
Key takeaways
- Concussion means the tooth is tender to touch but not loosened or moved.
- Subluxation means the tooth is loosened but still in its normal position, often with bleeding at the gum line.
- Neither injury usually needs the tooth to be repositioned, unlike more severe luxations.
- A short period of soft diet and rest, plus dental review, is the usual plan.
- The main long-term risk is to the nerve inside the tooth, so follow-up checks matter for months.
The one question that decides what happens next: has the tooth moved?
The single most useful thing to work out is whether the tooth has changed position. If it is tender or a little wobbly but still lines up exactly with its neighbours, you are most likely dealing with concussion or subluxation, which are managed conservatively. If the tooth looks pushed in, pushed out or sideways, that is a more serious luxation that needs prompt repositioning. When in doubt, treat it as urgent and have it assessed.
What these two injuries actually are
Both injuries affect the periodontal ligament, the cushion of fibres that holds a tooth in its socket, rather than breaking the tooth itself.
- Concussion. The ligament is bruised. The tooth is sensitive to biting or tapping but does not move and does not bleed from the gum.
- Subluxation. Some ligament fibres are torn. The tooth feels loose when gently wiggled, and there is often a little bleeding from the gum margin, but the tooth has not changed position.
Because the tooth has not moved, neither injury usually requires repositioning. Subluxation occasionally benefits from a flexible splint for around two weeks if the looseness is marked, but many cases need no splint at all.
What to do in the first hour
First aid here is about comfort and protection rather than emergency action:
- Rinse gently with water to clear any blood and check the tooth against its neighbours.
- Avoid wiggling the tooth to test it repeatedly, which can worsen the ligament injury.
- Use a cold compress on the lip or cheek for swelling, in short intervals.
- Stick to soft foods and avoid biting directly on the tooth.
- Manage discomfort with over-the-counter pain relief as directed on the packet.
- Book a dental review within a day or two, sooner if the tooth feels very loose or pain is severe.
What the dentist will do
At the appointment the dentist confirms the diagnosis, checks how the teeth bite together, and takes an X-ray to rule out a root fracture and to establish a baseline. For subluxation with noticeable looseness, a flexible splint bonded to the neighbouring teeth for about two weeks lets the ligament settle while still allowing slight natural movement, which helps healing. Concussion injuries generally need no splint at all.
Why follow-up matters for months
The biggest long-term risk after these injuries is to the dental pulp, the nerve and blood supply inside the tooth. The trauma can disrupt blood flow, and in a minority of cases the pulp slowly dies over weeks or months, which can later require root canal treatment. International trauma guidelines recommend monitoring for at least a year, with reviews at set intervals. Warning signs to watch for between visits include the tooth darkening in colour, increasing pain, a gum boil or new swelling.
| Feature | Concussion | Subluxation |
|---|---|---|
| Tooth loose? | No | Yes, slightly |
| Tooth moved out of position? | No | No |
| Bleeding at gum line? | Usually none | Often present |
| Splint usually needed? | No | Sometimes, around 2 weeks |
| Main follow-up concern | Pulp health | Pulp health |
General cost considerations in Australia
Assessment of a loosened tooth is usually modest in cost, with an examination and X-ray. A splint adds to this, and any later root canal treatment is a separate cost if the pulp does not survive. General Australian ranges are an examination around $60 to $120, a dental X-ray around $40 to $90, and a trauma splint around $200 to $500. These are market guides only, not a quote. Lumi Dental does not publish its own prices here. See the offers page for current options or request a written estimate.
Frequently asked questions
Will a loosened tooth tighten up again?
Yes, in most concussion and subluxation cases the ligament heals and the tooth firms up over a few weeks, provided it is rested and reviewed.
Do I need to go to hospital?
Not usually for an isolated loosened tooth. Seek urgent care if there is a suspected jaw fracture, heavy uncontrolled bleeding or a head injury, which need emergency assessment.
Can this happen to a baby tooth?
Yes. Loosened baby teeth are managed cautiously to protect the developing adult tooth underneath, and the plan can differ from adult teeth.
How long should I eat soft foods?
Around one to two weeks is typical, easing back to normal foods as the tooth settles and your dentist confirms it is healing.
Could I still lose the tooth later?
It is uncommon after mild injuries, but pulp death or root resorption can occasionally threaten a tooth months later, which is why ongoing checks are recommended.
Get it checked, then keep an eye on it
A tooth that is loosened but still in place usually has a good outlook, but it earns a dental review and a few months of watchfulness. If your tooth was pushed out of position rather than simply loosened, read our guide to tooth luxation injuries, and if a tooth was knocked out entirely, see how to store a knocked-out tooth. For an assessment after any knock, contact the team at Lumi Dental.
This article is general information and not a substitute for an in-person dental or medical assessment after an injury.
