Dentistry focuses on diagnosing, preventing, and treating conditions of the teeth, gums, and oral structures, supporting oral health and overall well-being.
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The signs of dental injuries can be very different depending on how hard and where the impact was. Symptoms may be as mild as sensitivity or as severe as pain and visible changes. At Liv Hospital, our team looks for both obvious and hidden signs of damage. Early detection is important because some problems, like root resorption or nerve death, can develop without clear symptoms. We group symptoms into what the patient feels and what the dentist observes during the exam.
Pain is the main reason people come in for dental injuries, and the type of pain can help the dentist figure out what’s wrong.
Dentin hypersensitivity: Sharp, fleeting pain in response to cold or air usually indicates an uncomplicated crown fracture in which dentin tubules are exposed, but the pulp is intact.
Spontaneous throbbing: A deep, pulsating ache that occurs without stimulation suggests irreversible pulp inflammation (pulpitis) resulting from the trauma.
Tenderness on biting: If it hurts when you bite down, it may mean the ligament around the tooth is inflamed. This often happens when the tooth has been pushed into its socket.
Neurogenic shock: Right after an injury, the tooth might feel numb or ‘stunned’ because the nerves are temporarily not working, even if the tissue is still healthy.
Luxation Signs
If the bone and ligaments that hold the tooth are hurt, the tooth can move out of its normal position.
Extrusion: The tooth appears longer than the adjacent teeth. It is highly mobile and often bleeds from the gingival crevice due to PDL tearing.
Lateral luxation: The tooth is displaced backward or forward. The crown may be pushed palatally, while the root apex is forced through the labial bone plate. These teeth are often locked in a new position and are not mobile.
Intrusion: The tooth looks shorter or may be hidden in the gum, which can look like it’s been knocked out. This is the most serious type of tooth displacement because it crushes the ligament and nerve supply.
Occlusal interference: The patient may report that their “bite feels off” or that they cannot fully close their mouth because the displaced tooth is contacting prematurely.
The color of an injured tooth can show how healthy the nerve and blood supply inside are.
Pink discoloration: A pinkish hue appearing shortly after trauma indicates internal hemorrhage, with ruptured capillaries in the pulp. This can sometimes be resolved with revascularization.
Grey or black darkening: If a tooth slowly turns grey, it usually means the nerve inside has died and blood is breaking down in the tooth. This often means dental treatment is needed.
Yellow opacification: A gradual yellowing of the crown over months or years indicates calcific metamorphosis, where the pulp chamber is being filled with dentin in response to the injury.
Translucency changes: If a tooth looks less shiny or becomes dull, it can be an early sign that the nerve is not healthy, even before the color changes.
Assessing Periodontal Integrity
A tooth becomes loose if the ligament is damaged or the root is broken.
Horizontal mobility: The tooth moves back and forth more than the physiological limit (usually >1mm), indicating damage to the alveolar bone or PDL rupture.
Vertical mobility: The tooth can be depressed into the socket, which is a specific sign of a root fracture or severe extrusion.
Dull percussion sound: Tapping a healthy tooth makes a clear sound. If the tooth or ligament is injured, it may sound dull instead.
High metallic sound: If tapping the tooth makes a high-pitched sound, it may mean the ligament is gone and the root has fused to the bone.
Dental injuries often affect not just the teeth but also the nearby gums, lips, and other soft tissues.
Lacerations: Cuts on the lips or tongue are common. It is critical to check these wounds for embedded tooth fragments, which can cause chronic infection or scarring.
Contusions: Bruising on the lips or face shows how hard the impact was and can mean there are broken bones underneath.
Gingival degloving: In serious injuries, the gum can be pulled away from the bone, exposing it and needing stitches to heal.
Fistula formation: If a dental injury is not treated, a small bump or ‘pimple’ may form on the gum, draining pus from a dead tooth.
Injuries to the face or jaw can hurt the main nerves, causing changes in feeling.
Paresthesia: A tingling or “pins and needles” sensation in the lip or chin suggests damage to the inferior alveolar nerve or mental nerve, often associated with jaw fractures.
Anesthesia: Complete numbness of the teeth or soft tissue indicates a severance or severe compression of the nerve supply.
Dysesthesia: Painful or abnormal sensations, such as burning, can occur due to nerve entrapment or inflammation.
Vitality testing response: If a tooth doesn’t react to cold or electric tests right after an injury, it doesn’t always mean it’s dead. The tooth might just be in shock and needs to be checked again later.
When a tooth is completely lost, there are certain signs that help dentists decide what to do right away.
Socket integrity: The alveolar socket may be empty or filled with a blood clot. The walls of the socket may be fractured or intact.
Coagulum formation: A stable blood clot is needed for healing. If the clot is disturbed, it can cause a dry socket or slow down healing.
Attached fragments: Sometimes, a piece of jawbone stays attached to a tooth that’s been knocked out. This changes how the dentist will treat and replant the tooth.
Time elapsed: Even though it’s not a symptom, how long the tooth has been out of the mouth is the most important factor in deciding treatment.
Send us all your questions or requests, and our expert team will assist you.
This is a sign of extrusion, where the tooth has been partially pulled out of its socket, or an apical periodontitis, where inflammation pushes the tooth up.
Yes, bleeding from the gingival sulcus (the space between the tooth and gum) usually indicates that the periodontal ligament has been torn or the root is fractured.
The impact likely caused microcracks in the enamel or exposed the dentin, allowing cold stimuli to irritate the nerve endings inside the tooth directly.
A grey tooth usually means the nerve inside has died (necrosis), and the byproducts of blood are staining the tooth structure; this typically requires a root canal.
In many cases of minor subluxation, the tooth will tighten up naturally within a few weeks if a soft diet is maintained and further trauma is avoided.
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