“Toothache” is one of the most intense pains in oral medicine.
Behind this common expression lies most often pulpitis, that is, inflammation of the dental pulp, the internal tissue rich in nerves and blood vessels.

When this inflammation becomes irreversible, the pain can become throbbing, spontaneous, and difficult to bear. Understanding its mechanism allows you to act at the right time.

What is pulpitis?

The pulp is the living tissue located at the center of the tooth.
It is protected by dentin and enamel.

Pulpitis generally appears following:

• a deep cavity
• a tooth fracture
• trauma
• an old, infiltrated restoration

Inflammation causes increased pressure in a closed space.
Unlike other tissues in the body, the pulp cannot expand freely.

Result: the pressure compresses the nerve fibers → intense pain.

Why does the pain become so intense?

Pulpitis pain is characteristic:

• throbbing
• spontaneous
• aggravated by heat
• sometimes temporarily relieved by cold

It can wake you at night and may not respond to usual painkillers.

This intensity is explained by:

• high intrapulpal pressure
• nerve compression
• lack of expansion space

Toothache and nighttime pain: what’s the connection?

The pain is often more pronounced at night.

In a lying position:

• local blood pressure increases
• vascular congestion is greater
• the painful sensation intensifies

This is why many patients seek emergency care after a difficult night.

Can pulpitis disappear on its own?

Two situations can be distinguished:

Reversible pulpitis

The inflammation is moderate.
Conservative treatment may be sufficient.

Irreversible pulpitis

The pulp is severely affected.
The pain becomes persistent.
Without treatment, it progresses to:

• pulp necrosis
• infection
• dental abscess

Irreversible pulpitis does not heal spontaneously.

What is the treatment for a toothache?

Treatment depends on the clinical diagnosis.

In most cases:

• endodontic treatment (root canal treatment)
• removal of inflamed tissue
• disinfection
• definitive restoration

The goal is to eliminate the cause of internal pressure.

Simple pain relief does not solve the problem.

Should you seek emergency care?

Yes, when:

• the pain is intense and persistent
• it prevents sleep
• it lasts more than 24–48 hours
• it is accompanied by swelling

Organized care allows:

• rapid relief
• prevention of progression to infection
• planning of appropriate treatment

Can pulpitis be prevented?

Prevention is based on:

• regular checkups
• early treatment of cavities
• monitoring of old restorations
• rigorous oral hygiene

A cavity treated early generally prevents pulp involvement.

Conclusion

Toothache is most often a sign of irreversible pulpitis.
Although the pain may seem to appear suddenly, the inflammatory process is generally progressive.

A clinical evaluation allows for an accurate diagnosis and prevents progression to more serious infectious complications.