Tooth Development in Children: Eruption Stages, Myths, Ebinyo and Dental Emergencies in Rwanda

How Do Teeth Develop?

Teeth begin developing before birth, even though most are not visible until infancy. A child usually has 20 primary teeth, sometimes called milk teeth or baby teeth. These help with biting and chewing, speech development and maintaining space for the permanent teeth. They are not disposable teeth: untreated decay or infection in a primary tooth can cause pain and may affect a child's eating, sleep and general wellbeing.

Permanent teeth begin to appear in childhood. Most children eventually have 28 permanent teeth excluding the four third molars, commonly called wisdom teeth; some people develop fewer wisdom teeth or none at all. The permanent first molars and lower front teeth often appear around age 6. The first permanent molars erupt at the back of the mouth, behind the last baby molars, rather than pushing out a baby tooth.

During the mixed-dentition stage, a child has a combination of primary and permanent teeth. This transition normally continues through the primary-school years and early adolescence. Roots of primary teeth gradually resorb as the permanent successors develop, allowing the baby teeth to loosen and shed. Not every permanent tooth has a primary predecessor: the permanent molars erupt into the mouth behind the baby teeth.

When Do Baby Teeth Erupt and Fall Out?

The first baby tooth commonly appears at about 6 months, often a lower central incisor. Many children have most or all of their 20 primary teeth by around age 2½ to 3, although timing varies. The chart below shows approximate eruption and shedding ranges from the ADA reference supplied for this article.

Children usually lose their lower front baby teeth first, followed by other teeth over several years. It is normal for a loose baby tooth to take time to fall out. Do not forcefully pull a tooth that is not ready to come out. If a baby tooth is lost much earlier than expected because of decay or injury, ask a dentist whether follow-up or space management is needed.

When Do Permanent Teeth Erupt?

Permanent teeth usually begin erupting around age 6. The first molars and lower central incisors are often among the first visible permanent teeth. Permanent incisors, canines, premolars and second molars then emerge through childhood and adolescence. Wisdom teeth may erupt in the late teens or early twenties, remain impacted, or never develop.

A tooth may erupt a little earlier or later and still be within normal development. The sequence can also vary. However, if one side has erupted noticeably ahead of the other, a tooth is far outside the expected range, a baby tooth remains while its successor seems stuck, or swelling or pain develops, arrange a dental examination rather than trying to diagnose the issue from an age chart alone.

When Should a Child First Visit the Dentist?

The American Dental Association and the American Academy of Pediatric Dentistry recommend a first dental visit after the first tooth erupts or no later than the first birthday. An early visit is an opportunity to check development, assess decay risk, demonstrate brushing, discuss feeding and sugar exposure, and help a child become familiar with dental care before pain occurs. Children at increased risk of decay or with a concerning dental finding may need earlier or more frequent reviews.

A child does not need to wait until all baby teeth are present or until a toothache develops. If access to a paediatric dental specialist is limited, a general dental assessment is still a useful starting point; the clinician can refer when specialist care is needed.

Natal Teeth and Neonatal Teeth: Teeth Present at Birth

A natal tooth is a tooth already visible at birth. A neonatal tooth erupts during the first 30 days after birth. These teeth are uncommon and are most often found in the lower front region. They may be part of the normal primary dentition, although a clinician may need to assess whether an unusual tooth is part of the expected set or an extra (supernumerary) tooth.

A tooth present at birth is not automatically dangerous and should not automatically be removed. A dentist needs to assess how firmly it is attached, whether it interferes with feeding, whether it causes an ulcer under the tongue, and whether there is a meaningful risk of the tooth becoming detached. Depending on the findings, management may be monitoring, smoothing a sharp edge, or when clinically justified, removal by a trained professional. Decisions involving newborns require particular care because of bleeding risk and feeding needs.

• Arrange prompt dental advice if the tooth is very loose, the baby struggles to feed, breastfeeding becomes painful, or the underside of the tongue develops a sore or ulcer.
• Do not try to pull, file or tie the tooth at home. A clinician should assess the infant and advise whether observation or treatment is appropriate.
• If the infant has difficulty breathing, cannot feed, has significant bleeding or appears acutely unwell, seek urgent medical care.

Delayed Eruption, Missing Teeth and Impacted Teeth

A tooth is impacted when it cannot erupt into its expected position because its path is blocked, its direction is abnormal, space is insufficient, or another local or developmental factor is involved. Wisdom teeth are a familiar example, but canines and other teeth can also be impacted. Some impacted teeth cause no obvious symptoms and are discovered during a dental examination or X-ray; others may contribute to pain, swelling, infection, crowding, or damage to neighbouring teeth.

Delayed eruption does not always mean impaction. Family patterns, the child's overall dental development, premature loss or retention of baby teeth, extra teeth, previous trauma and some health conditions can affect the timing. The dentist may compare both sides of the mouth and consider X-rays when the result would change diagnosis or treatment.

• Impacted canine: an upper canine that does not erupt as expected may remain trapped in the jaw or gum and can sometimes affect the roots of nearby teeth. Early assessment can help determine whether monitoring, orthodontic treatment, surgical exposure or another option is appropriate.
• Impacted wisdom tooth: it may be partly or fully covered by gum or bone. Potential complications include repeated gum infection, food trapping, decay or a cyst, but not every asymptomatic wisdom tooth needs removal. A dentist weighs the risks and may recommend monitoring.
• Supernumerary tooth: an extra tooth can obstruct the normal eruption path of a permanent tooth. It may not be visible without examination or imaging.
• Missing permanent tooth: a tooth may be absent because it never developed, was lost through injury, or remains unerupted. The management differs in each situation, so do not assume that a tooth is simply late.

Arrange assessment if a permanent tooth has not appeared when expected, one side is clearly different from the other, a baby tooth remains unusually long, the gum bulges without a tooth emerging, or pain and swelling develop. Seek urgent care for facial swelling, fever with dental pain, difficulty swallowing or breathing, or rapidly worsening symptoms.

Ibyinyo/Ebinyo and Infant Oral Mutilation: A Harmful Practice

Infant oral mutilation (IOM), known as eibyinyo,ebinyo or ebino in some communities, is a traditional practice in which the developing buds of primary teeth are cut, gouged or removed from an infant's gums. Published literature documents the practice in parts of East Africa. The available sources used for this article do not establish its current prevalence in Rwanda, so it should not be assumed that every community practises it. The purpose of discussing it here is to share health information respectfully and help protect infants wherever the practice may be encountered.

The practice is sometimes based on the belief that gum swellings or tooth buds cause diarrhoea, fever, vomiting, poor feeding or other childhood illness. These symptoms are not caused by tooth buds in the way the belief suggests. Diarrhoea and fever in infants can have serious causes and need appropriate assessment by a trained health professional. Removing tooth buds does not treat the underlying illness.

The procedure can cause severe bleeding, pain, damage to nearby tissues and the developing permanent teeth, serious bacterial infection, tetanus, and transmission of blood-borne infections when instruments are contaminated. Published clinical reports describe long-term effects including missing or malformed teeth. In severe cases, complications can be life-threatening. There is no proven health benefit to infant oral mutilation.

• Do not allow an untrained person to cut or remove a baby's gum tissue or tooth buds.
• If an infant has fever, diarrhoea, vomiting, poor feeding, unusual sleepiness or dehydration, seek medical assessment. Do not delay care to seek a traditional tooth-removal procedure.
• If a baby has already undergone this practice, seek prompt medical and dental assessment, even if the wound initially looks small. A clinician can assess bleeding, infection, injury to tooth buds, vaccination history and any need for further treatment.
• Health workers and community educators can discuss the risks without shaming families, listen to concerns, and help caregivers reach safe and timely medical care.

Common Myths About Tooth Development

Misinformation about teething, baby teeth and unusual eruption can delay care or expose children to unnecessary harm. Here are common myths and what the evidence indicates.

• Myth: Baby teeth do not matter because they will fall out. Fact: Primary teeth are important for chewing, speech, comfort and maintaining space. Decay or infection still needs care.
• Myth: Teething causes a high fever or diarrhoea. Fact: Teething may cause local gum discomfort and drooling, but a true fever, persistent diarrhoea, vomiting or a child who seems very unwell should not be blamed on teething. Seek medical advice.
• Myth: Every child must have teeth by exactly the same age. Fact: Eruption timing varies. Charts provide approximate ranges; the pattern, symptoms and clinical examination matter more than a single birthday.
• Myth: A tooth present at birth must always be pulled out. Fact: A natal tooth may be retained if it is stable and does not interfere with feeding or function. A dentist should assess it first.
• Myth: Ibyinyo/Ebinyo removes the cause of infant diarrhoea or fever. Fact: Tooth buds are not the cause of these illnesses. The practice can cause significant harm and should not be performed.
• Myth: Every impacted wisdom tooth needs immediate removal. Fact: The decision depends on symptoms, disease risk, clinical findings and imaging. Some teeth can be monitored by a dental professional.
• Myth: A tooth that has been knocked out can wait until tomorrow. Fact: A completely avulsed permanent tooth is time-critical. Seek dental care immediately; the chance of saving it depends heavily on prompt, correct first aid and treatment.
• Myth: A baby tooth knocked out in an accident should be put back. Fact: A primary tooth should not be replanted because doing so can injure the developing permanent tooth underneath. A dentist should assess the injury.

Teething: What Helps and What to Avoid

When a tooth is about to emerge, the gum may be tender and a baby may drool more or chew on objects. Gentle gum massage with a clean finger or a chilled (not frozen) teething ring may offer comfort. A caregiver can wipe drool from the skin and keep objects the baby chews on clean and safe.

Avoid teething necklaces or jewellery because of choking and strangulation risk. Do not use frozen objects that can injure the gum, and do not put aspirin, alcohol, ash, caustic substances or unprescribed preparations on the gums. The American Academy of Pediatric Dentistry advises against topical teething medicines containing benzocaine or lidocaine for infants because they can offer limited benefit and carry safety risks. Ask a healthcare professional before giving pain medicine to a young child.

How to Protect Baby Teeth and Newly Erupted Permanent Teeth

Start oral care early. Before teeth erupt, caregivers can gently clean the gums with clean gauze or a soft cloth. As soon as the first tooth appears, brush twice daily with a small, soft toothbrush and fluoride toothpaste in an age-appropriate amount. For children younger than 3 years, a rice-grain-sized smear is commonly recommended; from age 3 to 6, use a pea-sized amount and supervise brushing. Follow advice from the child's dentist and help children brush until they can clean all surfaces effectively.

Reduce how often teeth are exposed to sugary foods and drinks. Frequent sipping of sweetened drinks, juice, soda or sweet tea can increase the risk of early childhood caries. Do not put a baby to sleep with a bottle containing sugary drinks, and avoid repeatedly coating a pacifier in honey or sugar. Breastfeeding has important health benefits; as the child grows, tooth care also depends on brushing, diet, feeding frequency and individual caries risk.

• Brush twice daily with fluoride toothpaste, including last thing at night.
• Supervise children's brushing and help them reach the gumline and the chewing surfaces of new molars.
• Offer water as the usual drink between meals and limit frequent sugary snacks and drinks.
• Arrange routine dental visits and attend sooner when a tooth hurts, changes colour after trauma, breaks, or develops a cavity.
• Use a properly fitted mouthguard for sports with a risk of facial impact, and use age-appropriate car seats and other injury-prevention measures.

Dental Accidents: What to Do If a Tooth Is Injured

Falls, collisions, sports and road traffic incidents can cause a tooth to chip, crack, become displaced, or be completely knocked out. Tooth injuries may happen to baby teeth or permanent teeth, and the recommended treatment can be different. If the injury involved a serious blow to the head, loss of consciousness, vomiting, confusion, breathing problems or uncontrolled bleeding, prioritise emergency medical care as well as dental assessment.

Emergency: What to Do If a Permanent Tooth Is Knocked Out (Avulsion)

Avulsion means a tooth has been completely knocked out of its socket. An avulsed permanent tooth is a time-critical dental emergency. Prompt, correct first aid and immediate treatment offer the best chance of saving it, although replantation cannot guarantee long-term survival. Contact a dentist or dental emergency service immediately and tell them that a permanent tooth has been knocked out.

• 1. Make sure it is a permanent (adult) tooth. Never replant a baby tooth. If you are not sure whether it is a baby or permanent tooth, do not force it into the socket; get urgent professional advice.
• 2. Pick the tooth up by its white crown, not by the root. Avoid rubbing or touching the root surface.
• 3. If the patient is conscious, cooperative and able to follow instructions, and you are sure it is a permanent tooth, gently place it back into the socket in the correct orientation if this can be done easily. Do not force it.
• 4. If the tooth is dirty, rinse it gently and briefly with milk, saline or the patient's saliva. Do not scrub it, scrape the root or wrap it in tissue.
• 5. If it cannot be replanted safely, keep it moist in cold milk, saline or a tooth-preservation solution if available; saliva collected in a clean container may be another option. Do not let the tooth dry out, and avoid storing it in plain water if a better suitable medium is available.
• 6. Go for urgent dental care immediately, even if the tooth has been placed back in its socket or the patient has little pain. The dentist will assess the injury and arrange the required follow-up.

A replanted tooth may still develop complications, including damage to the root surface, infection or loss of vitality, and it requires follow-up. The aim of first aid is to improve the chance of a favourable result while getting the patient to a dental professional quickly. This information is consistent with the International Association of Dental Traumatology's guideline for avulsed permanent teeth.

What If a Baby Tooth Is Knocked Out?

Do not push an avulsed primary tooth back into the socket. Replanting a baby tooth can damage the developing permanent tooth beneath it. Keep the child calm, look for the tooth if safe to do so, control bleeding with gentle pressure using clean gauze, and arrange prompt dental assessment. The dentist can check whether the tooth was completely lost, displaced into the gum, or associated with an injury to the lip, jaw or other teeth.

If a child has a deep cut, uncontrolled bleeding, a suspected jaw fracture, difficulty breathing, or signs of a significant head injury, seek emergency medical care. Even when a baby tooth injury seems minor, a dental review helps assess damage and plan follow-up for the developing permanent tooth.

Other Tooth Injuries That Need Assessment

Not every dental injury is a knocked-out tooth. A tooth can be chipped, fractured, loosened or pushed sideways or deeper into the gum. A tooth may also change colour days or weeks after a blow. The injury may affect the root or the supporting tissues even when the visible damage seems small, so arrange dental assessment after a significant impact.

• Chipped or broken tooth: rinse the mouth gently with clean water, use a cold compress for facial swelling and seek dental advice promptly. Keep any fragment in a clean container and take it along if found.
• Loose or displaced tooth: do not repeatedly wiggle it or attempt to reposition it at home. Seek urgent dental care.
• Cut lip, cheek or tongue: apply gentle pressure with clean gauze. Seek urgent medical care for deep wounds, bleeding that will not stop, or difficulty breathing or swallowing.
• Severe toothache, facial swelling or fever: arrange urgent dental assessment. Rapidly spreading swelling, trouble swallowing or breathing, or swelling around the eye requires emergency care.

When to Seek Dental or Medical Help in Rwanda

Arrange a routine dental visit for a child's first tooth or first birthday, and continue regular check-ups. Book an earlier assessment if you notice unusual eruption, a tooth that appears stuck, a natal or neonatal tooth, persistent mouth sores, visible decay or an injury. A dental professional can decide whether observation, preventive care, imaging, paediatric dental care, orthodontics or oral surgery is appropriate.

Seek same-day urgent dental or medical assessment for a knocked-out permanent tooth, a displaced or fractured tooth, significant dental pain, gum or facial swelling, or a suspected infection. Go to an emergency medical service for difficulty breathing or swallowing, uncontrolled bleeding, severe facial trauma, loss of consciousness or a very unwell infant. If a child has undergone ibyinyo/ebinyo or another procedure that cut the gums, do not wait for symptoms to worsen before seeking professional care.

How DentRW Can Help

DentRW encourages parents and caregivers to seek advice early when a child's teeth appear unusual, a tooth is painful, or an injury occurs. A dental assessment can help distinguish normal development from a problem that needs treatment, explain preventive care, and determine whether referral to a paediatric dental or oral surgery service is appropriate.

For routine dental assessment, book an appointment with DentRW. For a knocked-out permanent tooth or another serious injury, contact a dental provider or seek urgent care immediately rather than waiting for a routine appointment. If there are signs of a medical emergency, go to the nearest emergency medical service.