Black Lines on Gums After Car Accident: Dental Concerns Explained - Dentistry

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After the car accident, a black line was found on the impacted gum area?


About a month ago, I was in a car accident, and two of my upper right front teeth were fractured, leaving one-third of them remaining.
Due to a laceration in my mouth, during the dressing change, I noticed a black line at the junction of my upper right front tooth and canine.
There is also a black line along the gum line between my lower right front tooth and canine that does not brush away.
My teeth are sensitive and uncomfortable, occasionally causing sharp pain.
Although the pain has not been as pronounced in the past few days, there is still a slight aching sensation.
I have a follow-up appointment in a week, and I am a bit worried that this might be a sign of nerve damage in my teeth.

Niming, 20~29 year old female. Ask Date: 2022/01/16

Dr. Lin Jiayong reply Dentistry


Hello: It is recommended to take X-rays at 1, 3, and 6 months after a car accident or trauma to check for any signs of nerve necrosis.
Since the accident just occurred, it is important to allow the body to rest and recover, so please do not be too anxious.
Sincerely, Lin Chia-Yung, Department of Dentistry, Taichung Hospital, Ministry of Health and Welfare.

Reply Date: 2022/01/16

More Info


After a car accident, discovering black lines on your gums can understandably cause concern, especially when accompanied by tooth sensitivity and discomfort. The presence of these black lines, particularly at the junction of your teeth and gums, may indicate several potential issues that warrant further investigation.

Firstly, the black lines you observe could be a result of several factors, including the accumulation of plaque, tartar, or even staining from food and beverages. However, given your recent trauma, it is essential to consider the possibility of more serious conditions, such as necrosis of the dental pulp (nerve death) or periodontal disease.

When a tooth is subjected to trauma, such as a fracture or significant impact, the blood supply to the tooth can be compromised. This can lead to pulp necrosis, where the nerve and blood vessels inside the tooth die. Symptoms of pulp necrosis may include sensitivity to temperature changes, pain when biting or chewing, and discoloration of the tooth. The black lines you see could potentially be related to this process, especially if they are accompanied by sensitivity and discomfort.

The fact that you are experiencing sensitivity and occasional sharp pain is concerning. While it is possible that these symptoms are related to the trauma and subsequent changes in your dental health, they could also indicate an underlying issue with the nerve of the tooth. It is crucial to monitor these symptoms closely, as they may worsen over time if left untreated.

In addition to the possibility of pulp necrosis, the black lines could also indicate gum recession or periodontal issues. Trauma can lead to inflammation of the gums, which may cause them to recede and expose the roots of the teeth. This exposure can lead to sensitivity and discomfort, as the roots are not protected by enamel and are more susceptible to external stimuli.

Given your situation, it is advisable to follow up with your dentist as soon as possible. They may recommend taking X-rays to assess the health of the tooth and surrounding structures. X-rays can help determine if there is any damage to the tooth's pulp or if there are signs of infection in the surrounding bone. Additionally, your dentist may perform a clinical examination to evaluate the health of your gums and the integrity of your teeth.

In the meantime, it is essential to maintain good oral hygiene practices. Continue brushing gently and using dental floss to keep the area clean, but be cautious not to irritate the sensitive areas. Avoiding extremely hot or cold foods and beverages may also help minimize discomfort.

In conclusion, while the black lines on your gums and the associated sensitivity may be concerning, they can arise from various causes, including trauma-related issues or periodontal disease. Prompt dental evaluation is crucial to determine the underlying cause and to initiate appropriate treatment. Your dentist will be able to provide you with a comprehensive assessment and guide you on the best course of action to ensure your dental health is restored.

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