Why Tooth Pain Gets Worse at Night
Toothaches that are manageable during the day can become unbearable at night. This is not your imagination. Several physical factors combine to make dental pain worse when you lie down.
Increased Blood Flow to the Head
When you lie down, blood no longer has to work against gravity to reach your head. This increases blood pressure in the blood vessels around your teeth and jaw. If a tooth is already inflamed, the extra blood flow creates more pressure on the nerve inside the tooth. This is why tooth pain often changes from a dull ache during the day to a throbbing pulse at night.
Fewer Distractions
During the day, work, conversations, and activity keep your attention away from low-level pain. At night, in a quiet and dark room, there is nothing to compete with the pain signal. Your brain focuses on it more intensely, which makes the same level of pain feel worse.
Nighttime Teeth Grinding (Bruxism)
Many people clench or grind their teeth during sleep without knowing it. This condition, called bruxism, puts enormous pressure on teeth and can cause or worsen tooth pain. If you wake up with sore jaw muscles, headaches, or tooth sensitivity, bruxism may be contributing to your nighttime pain.
Sinus Pressure When Lying Down
The roots of your upper back teeth sit very close to your sinus cavities. When you lie down, sinus fluid can pool and press against these roots, mimicking tooth pain. If you have a cold, allergies, or sinus congestion, this can explain why your upper teeth ache at night but feel better when you sit up.
Common Causes of Tooth Pain at Night
While positioning and blood flow explain why pain worsens at night, the underlying cause of the pain itself matters. The following conditions are the most frequent reasons for nighttime tooth pain.
Pulpitis (Inflammation of the Tooth Nerve)
Pulpitis is inflammation of the dental pulp, the tissue inside the tooth that contains nerves and blood vessels. Reversible pulpitis causes brief, sharp pain in response to hot or cold. Irreversible pulpitis causes spontaneous, lingering, or throbbing pain that often worsens at night. Irreversible pulpitis does not heal on its own and typically requires root canal treatment from an endodontist.
Deep Cavity or Decay
A cavity that has reached the dentin layer (the tissue beneath the enamel) exposes microscopic tubules that connect to the nerve. Temperature changes and pressure, including the pressure from increased blood flow at night, can trigger pain through these tubules. Left untreated, the decay can reach the pulp and cause an infection.
Cracked Tooth
A crack in a tooth can cause sharp pain when biting or releasing a bite, followed by lingering aching. At night, grinding or clenching can repeatedly stress the crack and irritate the nerve underneath. Cracks are difficult to diagnose because they often do not show on standard X-rays. An endodontist with a dental microscope is typically the best specialist to evaluate a suspected crack.
Dental Abscess
An abscess is a bacterial infection that forms a pocket of pus at the root tip or in the gum. Abscesses cause constant, deep, throbbing pain that intensifies at night. You may also notice swelling, a bad taste, or a pimple-like bump on the gum. A dental abscess requires professional treatment and will not resolve on its own. If you develop fever or facial swelling, seek care the same day.
Gum Recession or Periodontal Disease
When gums recede, the root surface of the tooth becomes exposed. Root surfaces lack the protective enamel layer and are highly sensitive to temperature and pressure changes. This sensitivity can flare up at night, especially if you breathe through your mouth while sleeping, which dries the exposed roots.
Home Remedies for Temporary Relief Tonight
These measures can help reduce tooth pain enough to get through the night. They are temporary and do not treat the underlying cause.
- Elevate your head with one or two extra pillows. This reduces blood flow to the head and can significantly decrease throbbing pain.
- Take ibuprofen (400-600 mg for adults). Ibuprofen reduces both pain and inflammation, making it more effective for dental pain than acetaminophen alone. Follow the dosing instructions on the label.
- Rinse gently with warm salt water (half a teaspoon of salt in 8 ounces of warm water). This can reduce bacteria and soothe irritated gum tissue.
- Apply a cold compress to the outside of your cheek near the painful area. Use 15 minutes on, 15 minutes off.
- Apply a small amount of clove oil to a cotton ball and hold it against the painful tooth. Clove oil contains eugenol, which has mild numbing properties.
- Avoid hot, cold, or sweet foods and drinks before bed, as these can trigger or worsen pain from exposed dentin or an inflamed nerve.
When Nighttime Tooth Pain Signals Something Serious
Some types of tooth pain at night indicate a condition that will not improve without professional treatment. See a dentist or endodontist as soon as possible if you experience any of the following.
- Pain that wakes you up from sleep or that throbs on its own without any trigger
- Pain that lingers for more than 30 seconds after exposure to hot or cold
- A constant, dull ache in a tooth that has gradually gotten worse over days or weeks
- Swelling in the gum, face, or jaw near the painful tooth
- Fever along with tooth pain (this suggests the infection may be spreading)
- Pain that does not respond to over-the-counter medication
Why You Should Not Ignore Persistent Tooth Pain
Tooth pain that persists for more than two days rarely resolves on its own. In most cases, the cause is either progressing decay, an infection, or structural damage to the tooth. Delaying treatment allows the problem to worsen. A cavity that could have been filled may progress to needing a root canal. An infection that could have been treated with a root canal may spread to the jaw or other tissues.
When to See an Endodontist for Tooth Pain at Night
If your nighttime tooth pain is caused by nerve inflammation, infection, or a cracked tooth, an endodontist is the specialist most qualified to diagnose and treat it. Endodontists complete 2 to 3 years of advanced training beyond dental school, focused on diagnosing tooth pain and performing root canal treatment.
See an endodontist when your tooth pain is spontaneous and throbbing, when it lingers after hot or cold exposure, when your general dentist suspects you need a root canal, or when a previous root canal may have failed. Most endodontists can see emergency patients within a day or two. Learn more on our endodontics specialty page.
Find an Endodontist Near You
If nighttime tooth pain is disrupting your sleep, find a verified endodontist in your area through the My Specialty Dentist directory. Many offer same-day or next-day appointments for patients in pain.
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