Maria came to me at her consultation: «I've hated my smile for 30 years. Every photo, lips closed. People call it ‚cute', I can't.» She had a 3 mm diastema between her upper central incisors. Fixable in 3-12 months depending on the route.

A diastema (Greek for «interval») is a gap larger than 0.5 mm between the front teeth. It's not a disease. 5-20% of adults have it as normal anatomy. Many want it closed for cosmetic reasons. or because food keeps getting stuck there.


5 causes of diastema

Understanding the cause is the key to choosing the right treatment.

1

Large lip frenulum (Frenulum labii)

Most common cause in adults, 40% of cases. The tissue band between upper lip and gum extends far between the incisors, preventing them from closing. Diagnosed in 2 seconds during exam. Treatment: frenectomy (band cut) with laser, 10 minutes, 200-400 € private.

2

Tooth-jaw size discrepancy

Small teeth in a large jaw, or large teeth with a normal jaw. Hereditary. 25% of diastema cases. Treatment: orthodontics (braces, Invisalign) or composite restoration (tooth buildup).

3

Missing lateral incisors

If lateral incisors (teeth 12 and 22) are missing congenitally or extracted, the central incisors drift outward and create a central gap. Treatment: implant for missing teeth or orthodontic space closure.

4

Childhood habits

Thumb sucking, prolonged pacifier use, tongue thrusting. all create pressure that pushes the front teeth apart. If the habit continues past age 6+, the effect persists. Treatment: orthodontics in adolescence or after age 25.

5

Periodontitis (bone loss)

Progressive periodontitis causes tooth support loss and drift. New gaps appear or existing ones widen. Treatment: first periodontitis therapy (PAR), then orthodontics to reposition teeth.


4 treatment options (cheap to expensive)

Which option fits depends on gap width, cause, age, budget. Real 2026 Hamburg data.

A

Composite restoration (bonding)

Fastest and cheapest option. The dentist adds composite to the side surfaces of the incisors, making them wider. Duration: 1 visit, 1-2 hours. Cost: 300-800 € private (2 teeth). Lifespan: 5-10 years, then refresh. Suitable for: gaps up to 2 mm, no bite issues.

B

Porcelain veneers

Thin ceramic shells on the front teeth. Aesthetically perfect, very durable. Duration: 2-3 visits, 3-4 weeks. Cost: 800-1500 € per tooth (private), 2-4 teeth, 1600-6000 €. Lifespan: 15-20 years. Suitable for: gaps up to 4 mm, also when you want to improve shape and color.

C

Orthodontics (Invisalign)

Clear removable aligners that gradually move the teeth. Most physiological option, no tooth tissue removed. Duration: 6-18 months. Cost: 3500-6500 € (full course, private). GKV doesn't pay for adults. Suitable for: gaps 2-5 mm, especially combined with other bite issues.

D

Braces (metal or ceramic)

Classic orthodontics. Brackets are bonded to teeth, wire moves them. Duration: 12-24 months. Cost: 2000-5000 € (private, adults). For under-18s with KIG 3-5, GKV covers partially. Suitable for: large gaps 4-8 mm, complex cases.


What GKV covers

The aesthetic part of diastema isn't covered. it's not a disease. But there are exceptions.

GKV-covered: treatment of the underlying medical cause (periodontitis, cyst removal); orthodontics for kids under 18 with KIG 3-5; extraction of supernumerary teeth (mesiodens); basic filling if there's caries.

💰 Private: composite restoration on front teeth (bonding), veneers, orthodontics for adults (Invisalign, lingual braces), implants for missing teeth.

🛡 Zahnzusatzversicherung: covers 70-90% of veneers, orthodontics, implants. provided you complete the 8-month waiting period. SIGN UP BEFORE your consultation, not after (otherwise rejected as pre-existing).


How to choose: checklist

Which to pick depends on your priorities. Checklist for your conversation with the dentist.

📐 Gap width: up to 2 mm, composite. 2-4 mm, veneers or Invisalign. 4-8 mm, Invisalign or braces.

Time: composite, 1 day. Veneers, 3-4 weeks. Invisalign, 6-18 months.

💰 Budget: under 1000 €, composite. 1500-4000 €, veneers. 3500-6500 €, Invisalign.

🦷 Tooth structure: composite minimal, veneers require 0.3-0.5 mm enamel removal (irreversible), Invisalign zero.

🌱 Other bite issues: if there are crooked teeth or bite problems, only orthodontics gives a complete result.