Tooth eruption is a normal physiological developmental process whereby teeth move from their position within the jaw bone into the oral cavity to become functional in mastication.

Eruption of deciduous (primary) teeth usually begins between 4–10 months of age, most commonly around 5–7 months, and completion of the full primary dentition (20 teeth) occurs by approximately 30 months of age.

Although several symptoms are traditionally associated with teething, current scientific evidence shows that eruption mainly causes local discomfort rather than systemic illness, and serious symptoms such as high fever or persistent diarrhea should prompt evaluation for other medical conditions.

Conditions associated with eruption requiring dental referral include:

• Eruption cyst

• Gingival cyst of the newborn

• Natal teeth

• Neonatal teeth

• Abnormal eruption pattern

Important cultural note:“Nylon teeth” is a mythical belief found in some communities and has no scientific basis. Harmful traditional removal practices may lead to infection, hemorrhage, or death and must be discouraged through health education.

Pathophysiology

Tooth eruption is a complex biologic process involving coordinated interaction between:

• Dental follicle

• Alveolar bone

• Periodontal ligament

• Root formation

• Cellular signaling mechanisms

Mechanism of Tooth Eruption

1. Tooth crown formation completes within bone.

2. Root formation begins.

3. Dental follicle releases signaling molecules stimulating:

   • Bone resorption above the tooth

   • Bone formation below the tooth

4. Tooth migrates occlusally toward oral cavity.

5. Gingival penetration occurs.

6. Tooth reaches functional occlusion.

Eruption is primarily under genetic control, with minor environmental influence such as nutrition and systemic health.

Chronology of Primary Tooth Eruption (Average)

• Lower central incisors: 6–10 months

• Upper central incisors: 8–12 months

• Lateral incisors: 9–16 months

• First molars: 13–19 months

• Canines: 16–23 months

• Second molars: 23–30 months

Signs and Symptoms

Normal Local Symptoms

Common physiological manifestations include:

• Gum swelling or redness

• Increased salivation (drooling)

• Desire to bite objects

• Gum rubbing

• Mild irritability

• Disturbed sleep

• Reduced appetite

Drooling, irritability, and sleep disturbance are the most consistently observed symptoms during eruption.

Mild Systemic Symptoms (May Coincide)

Some infants may demonstrate:

• Slight rise in body temperature (<37.5°C)

• Facial rash from drooling

• Restlessness

• Increased finger sucking

Evidence shows these symptoms are temporally associated but not directly caused by teething.

Symptoms NOT Caused by Teething (Require Medical Review)

• High fever (>38°C)

• Persistent diarrhea

• Vomiting

• Severe cough

• Convulsions

• Lethargy

Such symptoms usually indicate infection rather than tooth eruption.

Diagnostic Criteria

Diagnosis is clinical.

Normal Eruption

• Age appropriate tooth emergence

• Local gum irritation

• Absence of systemic illness

• Symmetrical eruption pattern

Abnormal Eruption Indicators

• Delayed eruption (>12 months without tooth)

• Early natal/neonatal teeth

• Swelling suggesting eruption cyst

• Malpositioned erupting tooth

• Feeding difficulty or trauma

Investigation

Clinical Assessment

• Age of child

• Feeding pattern

• Gum examination

• Presence of swelling or cyst

• Tooth position

• Oral hygiene status

Radiological Investigation (When Indicated)

• Periapical radiograph

• OPG X-ray

Used when:

• Delayed eruption suspected

• Missing tooth germ

• Impacted tooth

• Developmental anomaly suspected

Treatment

Management is mainly supportive.

Non-Pharmacological Management

Recommended first-line care:

• Gentle gum massage using clean finger

• Use of safe teething rings

• Cold clean cloth for chewing

• Adequate hydration

• Parental reassurance

• Maintenance of oral hygiene

Non-pharmacological approaches such as gum rubbing and teething rings significantly reduce discomfort.

Dental Referral Required When

• Eruption cyst enlarges

• Feeding difficulty occurs

• Trauma from natal teeth

• Infection suspected

• Abnormal eruption direction

Pharmacological Management

Medication is rarely necessary.

Pain or Irritability

(According to Tanzania STG)

• Paracetamol 10–15 mg/kg every 6–8 hours

OR

• Ibuprofen 5–10 mg/kg every 8 hours (age >6 months)

Important Safety Notes

Avoid:

• Topical anesthetic gels containing lidocaine or benzocaine in infants

• Herbal or alcohol preparations

• Traditional gum cutting practices

Complications

If improperly managed:

• Oral infection

• Feeding problems

• Failure to thrive

• Soft tissue trauma

• Malocclusion

• Psychological distress to caregivers

Traditional extraction of alleged “nylon teeth” may cause severe sepsis and hemorrhage.

Prevention

Primary Prevention

• Parent education on normal eruption

• Exclusive breastfeeding support

• Safe teething practices

• Avoid harmful cultural practices

Secondary Prevention

• Early dental visit by age 1 year

• Monitoring eruption sequence

• Early management of eruption abnormalities

Community Prevention

• Oral health education programs

• Integration into maternal and child health clinics

• Training community health workers

Parent and Caregiver Education

Parents should understand:

• Teething is a normal developmental stage

• Mild discomfort is expected

• Serious illness should never be attributed to teething

• Maintain infant oral hygiene even before full eruption

• Seek care if symptoms are severe or persistent

Prognosis

Excellent in normal physiological eruption.

Most children complete primary dentition without complications when proper education and monitoring are provided.