Updated on February 9, 2024
9 min read

7 Causes of Tooth Pain and How to Prevent Toothache

NewMouth is reader supported. We may earn a commission if you purchase something using one of our links. Advertising Disclosure.

Tooth Pain

Tooth pain has multiple causes that sometimes overlap. Tooth decay, injuries, or infections in or around your teeth can all cause a toothache.

Depending on the cause and location of the problem, you may feel an acute, throbbing pain that comes and goes, or a constant, dull ache. Dentists can treat and help prevent tooth pain.

Other Symptoms of a Toothache

A toothache can cause pain to occur or worsen from:

  • Chewing
  • Hot or cold foods or drinks
  • Brushing and flossing
  • Cold air

Dr. Khushbu Aggarwal, one of NewMouth’s in-house dentists, says tooth pain can sometimes be spontaneous, coming on suddenly or gradually without a specific trigger.

Pain from a toothache may spread to other parts of your jaw, head, or ears. It may be accompanied by swelling, pus or other leakage (exudate), or a visible sore inside your mouth.

Tooth Pain Relief

You may be able to take steps at home to reduce or relieve tooth pain. But the underlying cause may require professional treatment from a dentist or doctor.

Listen In Q&A Format

Tooth Pain Causes, Treatment, Remedies and Prevention
NewMouth Podcast

When to See a Dentist

If your toothache is severe, it’s time to see a dentist. Contact your dentist as soon as possible if you notice symptoms of an infection, such as:

  • Pain that interferes with your ability to function
  • Pain spreading to other parts of your jaw, head or neck
  • Fever or chills
  • Pus
  • Jaw or facial swelling
  • Difficulty eating or drinking

7 Causes of Tooth Pain and Toothaches

The following are possible toothache causes, many of which overlap.

For example, tooth decay and gum disease can contribute to each other, and both can cause abscesses. All three of these conditions can result in tooth pain.

1. Cavities (Tooth Decay)

Tooth decay (cavities or dental caries) is a common cause of tooth pain. Cavities are caused by oral bacteria that produce acid. This acid breaks down the hard, mineralized tooth tissues.

Tooth abscess progression through vector illustration

Once the bacteria acid dissolves enough enamel (outer layer of the tooth), it begins to affect the dentin underneath. This can cause the nerves within the inner part of the tooth (pulp) to feel pain.

The oral bacteria that cause tooth decay feed on carbohydrates such as sugar. This makes diets high in sugar a risk factor for the development of cavities.

Another tooth decay factor is saliva. Saliva helps remineralize teeth, but bacteria can cause too much mineral breakdown for your saliva to compensate, especially if you suffer from a decreased quantity or quality of saliva.1

Diabetes, certain medications, and habits such as smoking can cause your mouth to produce less saliva than normal.

Other Symptoms

Besides causing your teeth to hurt, tooth decay can cause increased sensitivity to heat and cold. It can also cause a foul taste or bad breath that doesn’t go away after brushing or rinsing.


Cavities are generally treated with fillings, which can be made from composite materials or various metals. Dentists remove decayed tissue from the tooth and replace it with the filling material. 

If the cavities have progressed significantly, more extensive treatments may be needed, such as root canal treatments, crowns, or tooth removals. 

You can prevent cavities from forming with good oral hygiene and a low-sugar diet.

2. Tooth Abscess

A dental abscess is an accumulation of pus that forms near or around a tooth. Advanced tooth decay can cause abscesses, due to an infection of the pulp (pulpal necrosis).2

Gum disease can also cause an abscess to form on the gums or near a tooth, which could also cause a toothache.

Failed root canal treatment is another common cause of abscesses.

Other Symptoms

Abscessed teeth are especially sensitive to touch. Abscesses often cause swelling that may even be visible outside of your mouth. 

The side of your face where the abscess is located may become painful and swollen.


Dentists treat abscesses by draining them and addressing the underlying infection. This may include prescription antibiotics.

If the affected tooth is salvageable, your dentist may perform a root canal. Otherwise, they will need to remove the tooth.

3. Gum Disease

Gum disease (periodontitis) can cause or contribute to tooth pain.

Healthy tooth and unhealthy tooth with periodontitis comparison illustration

Bacteria affecting the gums can spread to the teeth. And because gum disease can cause gum recession, more of your tooth surface can be exposed to the bacteria that cause tooth decay.

Advanced gum disease can cause teeth to loosen, which may also contribute to pain, especially when chewing.

Other Symptoms

Early-stage gum disease (gingivitis) may cause your gums to appear red and swollen and to bleed easily when brushing or flossing.

Symptoms of more advanced gum disease include:

  • Gingival recession (gums pulling back, exposing the roots of the teeth)
  • Deep gum pockets (the gaps the gums form around the teeth)
  • Loose teeth
  • Halitosis (bad breath) and a metallic taste


Gum disease is treated by cleaning or deep cleaning the tooth roots. Severe cases may be treated with surgery to remove or replace damaged tissue.

Diabetes and other systemic illnesses are associated with gum disease.3

4. Broken or Cracked Teeth

A fractured or broken tooth can be painful, as the sensitive nerves within the tooth may be exposed. Tooth injuries can happen due to falls, contact sport-related incidents, or other accidents.

Other Symptoms

The presence of other symptoms depends on the cause of the injury. A fractured tooth may be accompanied by a broken jaw or other facial bones or bleeding of the injured area.

An internally cracked tooth where no part of the tooth has completely broken off may experience  pain when releasing the tooth after biting.4


Broken teeth can be treated in different ways depending on the nature and severity of the injury. A tooth with no exposed pulp may be filled to its normal shape or shaved down and fitted with a dental cap (crown), or the lost fragment may be reattached.

In some cases, a broken tooth may require root canal therapy or have to be removed altogether.

5. Exposed Dentin

Some people experience dentinal hypersensitivity, which occurs when dentin becomes exposed. While dentin itself isn’t highly innervated (full of nerves), it connects to the pulp inside the tooth, which contains the nerves. 

The dentin can become exposed via enamel loss or gum recession. Tooth wear is a common cause of enamel loss, which may be due to bruxism (tooth grinding) or overly vigorous brushing.

Acid reflux, bulimia, and an excessively acidic diet can also cause enamel loss.

Other Symptoms

Cold air, food, or drinks are the most common triggers of dentin hypersensitivity.5

Exposed dentin may also be sensitive to heat or sugary or acidic foods. It can also make brushing and flossing painful.


While there is no one standard treatment for dentin hypersensitivity, a variety of desensitizing toothpastes and other products are available.

These products may contain arginine, strontium, potassium salts, or hydroxyapatite.

Ask your dentist about treatments or products that seal dentin tubules or reduce nerve sensitivity.

6. Emerging or Impacted Teeth

A tooth that is still emerging, or can’t emerge properly due to lack of space (impaction), can cause pain. This can apply to:

  • Babies, when their first teeth come in
  • Children, when their adult teeth start to emerge
  • Adults, due to emerging or impacted wisdom teeth
Impacted incisors overcrowded teeth

Other Symptoms

Emerging teeth may cause a feeling of pressure. In the case of impacted wisdom teeth, you may experience swelling or have trouble opening your mouth wide.


Pain from emerging teeth is manageable, but ultimately the teeth must erupt and fill into their natural space in the mouth.

Wisdom teeth that are impacted or fail to emerge fully may be removed. This is usually done when people are younger because increasing age can make the surgery and recovery difficult.6, 7

7. Other Causes

Dead Teeth

In some cases, advanced decay or trauma can cause a tooth to stop receiving adequate blood flow. Such a tooth is referred to as being dead, or necrotic.

3D illustration of a severe tooth decay

A dead tooth itself may not hurt, but if the tooth is still in the process of dying, the inflamed pulp at the center of the tooth may be very painful. The surrounding tissues may be in pain as well.

Root canal therapy or complete removal may be necessary.

Loose Restorations and Other Causes

A loose crown or filling may also cause tooth pain, as can failed implants or other restorations. Your dentist may need to repair or replace them.

Tooth pain can also be caused by:

  • Bruxism (grinding your teeth, especially at night)
  • Strenuous exercise or sex (exertion headache)
  • Angina
  • Sinus infections
  • Malocclusions (problems with your bite)
  • Food or foreign objects stuck in your teeth

Determining the Best Treatment

Dentists offer a variety of treatments, including fillings and other restorations, root canal therapy, and tooth extraction.

To determine which treatment is appropriate for your situation, your dentist will assess the extent of damage to your teeth and surrounding tissues.

They’ll also take into account which parts of your tooth are damaged or exposed. Worn enamel, for example, warrants a different treatment than inflamed pulp.

Sometimes a root canal is necessary due to a failed filling, while an extraction is necessary because of a failed root canal. Talk to your dentist about any concerns you may have.

Home Remedies 

Numbing gels or creams, over-the-counter (OTC) pain medication, and desensitizing products are all ways to manage tooth pain at home.

If you’re using any of these kinds of products, be sure to carefully follow their instructions. Don’t use them to replace going to the dentist if your situation requires professional attention.

Dr. Aggarwal also mentions the following as possible home remedies:

  • Using saltwater rinses and practicing good oral hygiene, both of which can help minimize inflammation
  • Chewing less on the affected side, which can prevent further pain and damage
  • Staying away from triggering factors, such as hot and/or cold drinks or sweet foods

Can You Prevent Tooth Pain? 

Some causes of tooth pain, such as accidental injury, don’t have any one foolproof method of prevention.

But you can prevent some of the most common causes, including tooth decay and gum disease, with:

  • Good oral hygiene, including regular brushing, flossing, and rinsing
  • Use of xylitol products 
  • A healthy diet low in sugar and high in micronutrients and omega-3 fatty acids8

Both of these can prevent the bacteria that cause tooth decay and gum disease from building up in your mouth.


Toothaches have a variety of causes, some more serious than others. You can’t prevent every possible cause of tooth pain, but some can be kept at bay through diet and oral hygiene.

Talk to your dentist as soon as possible if you’re in severe pain or have symptoms such as fever or swelling.

Last updated on February 9, 2024
8 Sources Cited
Last updated on February 9, 2024
All NewMouth content is medically reviewed and fact-checked by a licensed dentist or orthodontist to ensure the information is factual, current, and relevant.

We have strict sourcing guidelines and only cite from current scientific research, such as scholarly articles, dentistry textbooks, government agencies, and medical journals. This also includes information provided by the American Dental Association (ADA), the American Association of Orthodontics (AAO), and the American Academy of Pediatrics (AAP).
  1. Segura, Adriana et al. “Maintaining and Improving the Oral Health of Young Children.” vol. 134,6 : 1224-1229.
  2. Clarkson, Jan E. et al. “Pulpotomy for the Management of Irreversible Pulpitis in Mature Teeth (PIP): a feasibility study.” Pilot and Feasibility Studies vol. 8,77 .
  3. Nibali, Luigi et al. “Severe periodontitis is associated with systemic inflammation and a dysmetabolic status: a case–control study.” Journal of clinical periodontology vol. 34,11 : 931-937.
  4. Banerji, S. et al. “Cracked tooth syndrome. Part 1: aetiology and diagnosis.” British Dental Journal vol. 208 : 459-463.
  5. Karim, B.F.A., and D.G. Gillam. “The efficacy of strontium and potassium toothpastes in treating dentine hypersensitivity: a systematic review.” International journal of dentistry vol. 2013 : 573258.
  6. Dodson, Thomas B. “Mythbusters and Wisdom Teeth.American journal of public health vol. 98,4 : 581-582. doi:10.2105/AJPH.2007.129577
  7. Friedman, Jay W. “The prophylactic extraction of third molars: a public health hazard.American journal of public health vol. 97,9 : 1554-9.
  8. Woelber, JP, et al. “An oral health optimized diet can reduce gingival and periodontal inflammation in humans – a randomized controlled pilot study.BMC Oral Health vol. 17,28 . https://doi.org/10.1186/s12903-016-0257-1
linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram