Cat Can’t Close Its Mouth — Symptoms, Causes, and Treatment Timing for Temporomandibular Joint Dislocation

Oral HealthDiseasesMeongsiljang Veterinary Advisory Board

Feline temporomandibular joint dislocation is a condition in which the jaw becomes displaced from its normal position, making it difficult for the cat to eat or vocalize. Immediate veterinary care is required.

Feline Temporomandibular Joint Dislocation Is a Condition Where the Jaw Displaces from Its Normal Position

An image of a cat’s face near the area affected by discomfort due to temporomandibular joint dislocation

Feline temporomandibular joint (TMJ) luxation occurs when the condylar process of the mandible (lower jawbone) dislocates from the joint, making it difficult to close the mouth properly or chew. The dislocation most commonly occurs in a rostrodorsal direction, causing the lower jaw to be displaced to the opposite side and resulting in malocclusion, where the upper and lower teeth abnormally contact each other. - Trauma: Strong impacts from falls, vehicle accidents, or fights are the most common causes. - Rare occurrence: TMJ luxation is an uncommon condition in cats. - Conditions often confused: It can be easily mistaken for "open-mouth jaw locking," a condition where the mouth remains open and cannot close. However, these are distinct diseases with entirely different causes, mechanisms, and treatments, so accurate differential diagnosis is essential. Because the inability to close the mouth significantly hinders eating and swallowing, immediate veterinary care is necessary, and early treatment aids recovery.

The Main Causes Are Trauma, Surgery, and Jaw Muscle Tension

Trauma is the primary cause of temporomandibular joint dislocation in cats. Strong impacts to the jaw from falls, vehicle accidents, or fights can lead to dislocation. According to veterinary textbooks, most temporomandibular joint dislocations result from trauma, and they are relatively uncommon in cats. When dislocation occurs, the condylar process of the lower jaw typically shifts forward and upward, causing the lower jaw to be displaced to the opposite side. On the other hand, "open-mouth lockjaw," where the jaw remains stuck open after being widely extended, is a completely separate condition with different causes, mechanisms, and treatments from dislocation. Therefore, it is important to accurately distinguish between the two, even though they may appear similar externally. Environmental management to reduce trauma and early vigilance are essential.

An anatomical illustration showing the structure of a cat's temporomandibular joint

Key Symptoms Include Inability to Close the Mouth and Difficulty Eating

A hallmark sign of temporomandibular joint dislocation in cats is the inability to close the mouth properly, which makes eating difficult. The misalignment of the lower jaw causes malocclusion, where the upper and lower teeth meet abnormally, preventing the mouth from closing completely. As a result, your cat may experience significant discomfort when chewing or swallowing and might exhibit behaviors such as pawing at or paying excessive attention to the mouth area. Pain can also lead to anxiety or reluctance to open the mouth. If the inability to close the mouth persists, it can impair food and water intake, so prompt veterinary care is essential.

A photo of a cat with its mouth open due to temporomandibular joint dislocation

This Is an Emergency Situation Requiring Immediate Veterinary Care

If your cat is unable to close its mouth, has difficulty eating, or shows signs of pain, seek veterinary care immediately. The longer a dislocation goes untreated, the more difficult it becomes to correct, and there is a risk of further injury. Accurate diagnosis and professional manipulation by a veterinarian are essential.

Diagnosis Is Confirmed Through Physical Examination and Radiography

Feline temporomandibular joint dislocation can usually be confirmed through a veterinarian’s physical examination. The vet will look for abnormalities when the cat opens or closes its mouth and directly check the position of the jaw. If necessary, X-rays are used to accurately determine the extent of the dislocation and any bone damage. CT scans may also be utilized in complex cases or recurrent dislocations. An accurate diagnosis is crucial for determining the treatment plan, and early diagnosis can aid in recovery.

A dental radiograph capturing the cat's jaw

Treatment Involves the Veterinarian Manually Returning the Joint to Its Proper Position

Treatment for feline temporomandibular joint luxation involves reduction, which means returning the dislocated joint to its proper position. Textbooks commonly describe a closed reduction technique in which a wooden dowel is placed between the upper and lower molars (carnassial teeth) to close the mouth and guide the joint back into place. Because this procedure can be painful, sedation or anesthesia is often required. The prognosis is generally good for acute, uncomplicated luxations that are properly reduced. However, the outlook is less favorable in chronic or recurrent cases, or when complications such as fractures of the condylar process or mandibular ramus are present, potentially requiring surgical intervention like condylectomy. After treatment, it is important to manage the cat carefully to avoid placing undue stress on the jaw.

A veterinarian manipulating a cat's temporomandibular joint

Home Care Focuses on Stabilizing the Jaw and Providing Soft Foods

After treatment, it’s crucial to keep the jaw stable. Avoid any jaw movement and offer soft foods such as jelly-type pet food, mashed meals, or liquid diets. Using a straw or spoon for feeding can also be helpful. Throughout the recovery period, take care to prevent any strain on the jaw, avoiding actions that involve wide mouth opening or strong trauma. Regular veterinary check-ups are recommended to monitor the healing progress.

Avoid Straining the Jaw to Prevent Recurrence

Temporomandibular joint dislocation can recur. Avoid activities that involve opening the mouth too wide or subjecting the jaw to strong trauma. Pay close attention to the condition of the jaw, especially before and after dental examinations or surgeries. If recurrences persist, surgical treatment may be considered.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Is temporomandibular joint dislocation common in cats?

Not at all. Temporomandibular joint dislocation is a relatively uncommon condition in cats, typically occurring after trauma. However, if it does occur, immediate treatment is essential.

How long does it take to recover after treatment?

The recovery period varies depending on the severity of the dislocation and the presence of any complications. Prognosis is generally favorable for acute dislocations without complications that are properly reduced. During recovery, it is advisable to offer soft food and restrict activity to avoid straining the jaw.

Can it recur?

Yes, it can recur. Repeated actions or injuries that strain the jaw increase the likelihood of recurrence. Prevention is key to reducing trauma.

Can I manipulate my pet’s jaw at home?

Absolutely not. Setting a fracture requires specialized veterinary skills, and improper handling can cause further injury. Your pet must be examined by a veterinarian.

Does a temporomandibular joint dislocation require surgery?

In most cases, a dislocated jaw joint can be successfully treated by manually repositioning it using a closed reduction technique, such as placing a stick between the molars to keep the jaw closed. However, if the condition becomes chronic, recurs frequently, or involves complications like fractures of the articular process or mandibular ramus, surgical treatment may be considered.

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References

[1] DeBowes LJ. The Cat, Clinical Medicine and Management, 2nd Edition. 2023.

[2] Bellows J. Feline Dentistry – Oral Assessment, Treatment, and Preventative Care. 1st ed. Wiley-Blackwell, 2010.

[3] Perry R, Moore D, Scurrell E. Globe penetration in a cat following maxillary nerve block for dental surgery. J Feline Med Surg. 2015;17:66–72.