A gap between the two upper front teeth is one of the most common features of a smile, and for most people it simply reflects how their mouth was built. It often runs in families, so a parent or sibling with the same gap is one clue that yours is inherited.1Greenwich Dentistry. Signs It’s Time to Fix the Gap in Your Teeth A gap that appears or widens in adulthood is a different story, because it can signal a problem with the gums or bone holding the teeth. Whether a gap counts as a flaw is largely a matter of taste: in some places a modest gap is considered especially attractive.2PubMed Central. Maxillary Midline Diastemas in West African Smiles
How Common a Front-Tooth Gap Is
A gap between the upper front teeth is the most common tooth gap.3Greenwich Dentistry. Signs It’s Time to Fix the Gap in Your Teeth In one dental clinic group, about 25% of patients had one, and two-thirds of them were male.4PubMed Central. Median diastema: Prevalence, novel classification, and evidence-based investigation
A dentist cares less about the exact size of a gap than about whether it is new, stable or growing. Taking a dated smile photo every few months makes any change easy to see.
In children, a gap between the upper front teeth is a normal part of development while baby and adult teeth are mixed, roughly ages 6 to 12.5PubMed Central. When the Midline Diastema Is Not Characteristic of the “Ugly Duckling” Stage At this stage the roots of the front and side teeth splay apart, which is why it is sometimes called the “ugly duckling” stage.6PubMed Central. When the Midline Diastema Is Not Characteristic of the “Ugly Duckling” Stage
The permanent canines sit high in the bone beside the side teeth. As they erupt, they push the roots of the side and front teeth inward, and many childhood gaps narrow on their own as a result. Before the canines arrive, a gap is expected and usually not treated.
A gap that does not fit this pattern is worth having a dentist check, because it can have other causes.7PubMed Central. When the Midline Diastema Is Not Characteristic of the “Ugly Duckling” Stage One that stays wide after the canines erupt, around age 11 to 13, deserves a look. The dentist may take an X-ray to check the roots and look for extra teeth.
The Most Common Causes: Teeth Size, Jaw Size and Genes
If your jaw is relatively large and your teeth relatively small, the extra room can settle as a gap.8Kali Dental. What Causes Gaps in Front Teeth? Tooth size and jaw size are largely inherited, which is why gaps run in families.9Greenwich Dentistry. Signs It’s Time to Fix the Gap in Your Teeth A gap from tooth and jaw size causes no damage to teeth or gums on its own.
The frenum is the thin band of tissue joining the inside of your upper lip to the gum above your front teeth. Dental researchers consider the type of frenum attachment an important cause of front-tooth gaps.10PubMed Central. Evaluation of the distance between the central teeth after frenectomy: a randomized clinical study When the band attaches low, reaching into or through the little point of gum between the front teeth, it is linked with a gap.11PubMed. Association between superior labial frenum and maxillary midline diastema – a systematic review A review of many studies found the same link for these low-attaching types.12RGO – Revista Gaúcha de Odontologia. Morphological variations of the labial frenum, type of attachment and presence of diastemas: integrative review A low band that pulls on loose gum with each lip movement can also contribute to gum recession and deeper gum pockets.13PubMed Central. Evaluation of the distance between the central teeth after frenectomy: a randomized clinical study
You can look at yours in a mirror. Lift your upper lip and find the band running to the gum. Only a dentist can judge whether it is causing the gap.
A thick or low band is one clue among several: many people with a low-attaching band have no gap, and many people with a gap have an ordinary band. In young children the band often looks prominent while the jaw is still growing. It can look smaller and sit higher as the permanent teeth come in, so a dentist usually waits before judging it.
To decide if the band is the cause, the dentist looks at where it ends, whether in the gum, between the teeth or reaching toward the biting surface. An X-ray can show a notch in the bone between the front teeth, which is one sign the band may be involved. Other causes, such as an extra tooth or small side teeth, get ruled out first, because several causes can exist together. Tooth shape, tongue position and habits also play a part in gap formation.14PubMed Central. Evaluation of the distance between the central teeth after frenectomy: a randomized clinical study
Missing, Small or Extra Teeth
The teeth next to the front two can grow smaller than normal, sometimes cone-shaped.15PubMed Central. A Multidisciplinary Aesthetic Treatment Approach for Peg Lateral of the Maxillary Incisors Smaller teeth leave unused space that can collect as a front gap.16PubMed Central. A Multidisciplinary Aesthetic Treatment Approach for Peg Lateral of the Maxillary Incisors Undersized side teeth can also affect how the canines come in and how the bite fits together.17Dental Update. Management of microdont maxillary lateral incisors Sometimes a side tooth fails to form at all, which leaves a gap in the upper front teeth.18PubMed Central. Orthodontic Space Closure of a Missing Maxillary Lateral Incisor Followed by Canine Lateralization Missing or extra teeth usually need an X-ray to find.
When a side tooth never formed, the space beside the front tooth can open and the neighbouring teeth may drift into it. A dentist then chooses between closing the space with braces or keeping it open for a replacement such as an implant or bridge, once growth is complete. A small side tooth can be built up with bonding or a veneer to close the gap, sometimes after braces rearrange space.
Some people have an extra tooth, called a mesiodens, between the two front teeth, often hidden in the bone.19PubMed Central. Diagnosis and management of supernumerary (mesiodens): a review of the literature It can sit above the front teeth and push the neighbours apart as it grows, leaving a gap before anyone sees the cause. It can also block a front tooth from coming in, so one front tooth may be late or missing on one side while its partner has already arrived.
About half of these extra teeth cause problems for nearby teeth, and the most common is pushing them out of place.20PubMed Central. Influence of mesiodens on adjacent teeth and the timing of its safe removal They can also cause food trapping and cysts.21PubMed Central. Diagnosis and management of supernumerary (mesiodens): a review of the literature Removing one early can prevent damage to nearby roots and reduce later orthodontic work.22PubMed. Mesiodens Removal: Resolving the Early Versus Late Intervention Dilemma A child whose gap stays wide after the canines erupt may need an X-ray to rule out an extra tooth.
Thumb Sucking and Tongue Pushing
Pressure from a thumb between the front teeth pushes the upper front teeth outward and the lower ones inward.23PubMed Central. Influence of Oral Habits on Pediatric Malocclusion: Etiology and Preventive Approaches This can lead to protruding upper teeth and an open bite, where the front teeth don’t meet.24PubMed Central. Influence of Oral Habits on Pediatric Malocclusion: Etiology and Preventive Approaches
A tongue that rests low and forward presses lightly on the teeth for many hours a day.25PubMed Central. Effect of Tongue Thrust Swallowing on Position of Anterior Teeth26PubMed Central. Effect of Tongue Thrust Swallowing on Position of Anterior Teeth In growing children, a low tongue can also keep the upper jaw from widening normally.27PubMed Central. Effect of Tongue Thrust Swallowing on Position of Anterior Teeth
Signs of a habit include front teeth that fan outward rather than sitting straight, and a tongue that shows between the teeth when swallowing or talking.
The age at which a habit stops matters. In young children the bone is soft and still growing, so teeth moved by a thumb often drift back on their own once the habit ends. If it continues while the permanent front teeth erupt, the changes in tooth position and bite are more likely to last and may need braces.
For children who suck their thumbs, gentle reminders and rewards help. Speech or tongue-training therapy can retrain tongue position. If a habit continues, a gap may reopen after braces.
When a Gap Appears or Widens in Adulthood
Advanced gum disease destroys the bone holding the teeth in place.28LIC Dental Associates. Fixing a Gap Between Your Front Teeth The teeth then loosen and can drift apart, opening new gaps.29Eric J. Marsh, DMD & Michele A. Pisano-Marsh, DMD Dentistry. How to Fix a Gap Between Your Front Teeth | What Causes Tooth Gaps With less support, the biting force and the tongue’s push can nudge the upper front teeth forward and apart, often one tooth first. That is why a gap that opens in adulthood often comes with teeth that look longer as gums recede, or feel slightly loose.
Other signs to look for are bleeding when brushing, swollen or receding gums and persistent bad breath. The disease is often painless until late. See a dentist promptly if your front teeth start to spread, feel loose, or your gums bleed. The dentist will check for bleeding, measure the depth of the spaces between gum and tooth, and test whether any teeth move. X-rays show how much bone has been lost, which tells whether the gap comes from gum disease or from something else, such as a habit or a change in bite.
If gum disease is found, a deep cleaning and better home care are usually the first steps. Closing the gap waits until the gums are treated, because moving teeth with weak bone support can worsen the problem. Once things are stable, braces or bonding can close any remaining space.
A few genetic conditions, such as Williams syndrome, include small teeth and gaps among their features.30SONDE (Sound of Dentistry). From Genes to Teeth: A Scoping Review on Dental Anomalies and Dentition Alterations in Genetic Syndromes These conditions have many other signs, so a gap alone does not suggest one.
Closing the Gap and Keeping It Closed
The right treatment depends on what caused the gap.31Current Approaches in Orthodontics. Stability of Diastemas Closure after Orthodontic Treatment Options include braces, bonding and veneers.32PubMed Central. A Multidisciplinary Aesthetic Treatment Approach for Peg Lateral of the Maxillary Incisors
Bonding adds tooth-colored material to widen teeth, often in one visit. Veneers are thin shells covering the front of the tooth, more durable but more costly. Braces move teeth, take months, and suit larger gaps. Bonding on a very large gap can make teeth look too wide.
If a low band is involved, frenum surgery is a minor procedure that trims the band under the lip. It is usually done with or after braces, and healing usually takes days to a couple of weeks.
After braces, about 9 in 10 closed front-midline gaps stayed closed in one group of treated patients.33PubMed Central. Stability of maxillary interincisor diastema closure after extraction orthodontic treatment Gaps can still reopen, and closing a gap without addressing a low frenum makes that more likely.34Current Approaches in Orthodontics. Stability of Diastemas Closure after Orthodontic Treatment Cutting the tissue fibers around the teeth alongside a retainer improves stability.35Current Approaches in Orthodontics. Stability of Diastemas Closure after Orthodontic Treatment
After braces, fibres in the gum can pull teeth back toward their old position, and a cause such as a low band or tongue push keeps working against the new position. This is why dentists plan for retention from the start.
A retainer is a thin wire or plastic device worn after braces to hold teeth in place. A fixed one is glued behind the teeth and is often recommended for keeping a gap closed, and removable ones are generally considered less effective for this.36Current Approaches in Orthodontics. Stability of Diastemas Closure after Orthodontic Treatment Expect to wear a retainer long-term, possibly for life. A fixed wire needs careful cleaning, often with floss threaders or small brushes, because plaque collects around it. Wires can come loose or break, so a loose retainer should be repaired quickly, since teeth can shift within days or weeks.
Does a Gap Affect Speech or Confidence
Wide spacing between teeth can let air leak and blur sounds that need a tight seal, such as s.37Journal of Advanced Medical and Dental Sciences Research. Speech Delay Due To Various Dental Anomalies And Their Management A wide gap can turn them into a slight whistle or lisp. Many people with a gap speak perfectly clearly, because the tongue adapts. A speech therapist can help if a gap affects clarity. A new whistle after a change in the front teeth, such as a new restoration, is worth mentioning to the dentist.
Some people with a noticeable gap feel self-conscious and avoid smiling.38Lasley Orthodontics. Lasley Orthodontics Yet in one study, a gap of 2 to 4 mm was rated the most attractive smile.39PubMed Central. Maxillary Midline Diastemas in West African Smiles
A genetic gap needs no treatment for health reasons, so the choice rests on your own feelings about your smile. Before deciding, it is worth discussing the cost, the time and the retainer commitment.