Why retention matters
Moving teeth with braces or aligners does not permanently fix their new positions. Once the active appliance is removed, teeth have a biological tendency to drift back toward where they started — a process called relapse. Retention — wearing retainers as prescribed — is how you protect the result you spent months or years achieving.
The British Orthodontic Society recommends indefinite retainer wear. This is not a conservative position: clinical evidence shows that some tooth movement continues throughout life, and that retainer wear is the only reliable way to maintain orthodontic results long-term.
Patients who stop wearing retainers — even years after treatment — commonly experience measurable relapse. The degree of relapse varies by individual, but it is unpredictable. Some patients retain results well; others see significant movement within months of stopping.
Types of retainer
There are two main categories: fixed (bonded) retainers and removable retainers. Many patients are prescribed a combination — a fixed retainer on the lower front teeth and a removable retainer for the upper arch.
Fixed (bonded) retainers
A thin wire is bonded to the back surfaces of the teeth, typically across the lower front six teeth. It is invisible from the front and requires no patient effort — it works continuously without being worn or remembered.
Pros: always in place; no compliance required; no risk of losing it; invisible
Cons: flossing requires a threader or superfloss; wire can break or debond without you noticing; may need professional repair; cannot be removed to clean as thoroughly
Typical lifespan: 5–10+ years with good care; should be checked at routine dental appointments
Essix (clear vacuum-formed) retainers
Clear plastic trays similar in appearance to Invisalign aligners, fitted to your final tooth position. These are the most commonly prescribed removable retainer and are familiar to aligner treatment patients since they use the same format.
Pros: discreet; easy to clean; can be removed for eating and brushing; inexpensive to replace
Cons: requires compliance — if not worn, they do not retain; can warp if exposed to heat; may crack over time; need replacing every 1–3 years depending on wear
Replacement cost: approximately £75–£200 per arch in the UK
Hawley retainers
A traditional acrylic plate with a wire clasp. Less commonly prescribed now than Essix retainers, but still used for certain cases — particularly where the orthodontist wants some minor settling movement to continue after debond.
Pros: durable; adjustable; allows teeth to settle naturally together; can last many years
Cons: more visible than Essix; bulkier; can affect speech initially; less commonly offered by UK providers
Replacement cost: approximately £150–£350 in the UK
How long do you need to wear retainers?
The short answer is: for as long as you want to keep your results. The British Orthodontic Society's guidance, shared by most UK orthodontists, is indefinite wear. This means:
| Phase | Wear schedule | Duration |
|---|---|---|
| Post-debond (months 1–3) | Full time (22+ hours/day) | First 3 months |
| Consolidation (months 4–6) | Full time or reducing to nights | Months 3–6 |
| Maintenance | Night-only (every night) | Indefinitely |
After the full-time phase, most patients transition to night-only wear. If you stop wearing retainers entirely, you accept the risk that some tooth movement will occur. The British Orthodontic Society notes that teeth never become permanently stable and that there is no safe point at which retainer wear can be entirely stopped.
What happens if you stop wearing your retainer?
Teeth will begin to drift. The degree and speed of relapse depends on:
How long ago treatment finished — teeth are least stable in the 12 months immediately post-treatment
The original severity of the problem — teeth that were significantly crowded or displaced tend to relapse more
Tongue posture and muscle pressure — soft tissue forces continue to influence tooth position throughout life
Wisdom teeth — erupting or impacted third molars can push front teeth forward
Natural aging — late growth changes can affect tooth alignment into adulthood
If you have lost or broken a retainer and notice teeth have moved, see your orthodontist promptly. A new retainer fitted quickly may hold the current position; significant relapse may require retreatment.
Retainer costs in the UK
The cost of your first set of retainers is usually included within the overall treatment fee. Replacement retainers (lost, broken, or worn out) are charged separately.
| Retainer type | Included in treatment? | Replacement cost (per arch) |
|---|---|---|
| Essix (clear plastic) | Usually yes (1st set) | £75–£200 per arch |
| Hawley (wire and acrylic) | Usually yes (1st set) | £150–£350 per arch |
| Fixed (bonded wire) | Usually yes (at debond) | £75–£200 (repair/replace) |
Caring for your retainers
Fixed retainers
Use a floss threader or superfloss daily to clean underneath and around the wire
Interdental brushes can help reach between teeth behind the wire
Check the wire regularly with your tongue — if it feels loose or detached, contact your orthodontist
Attend routine dental hygiene appointments — plaque builds more easily around fixed wires
Removable retainers
Rinse with cool water when you remove them — never hot water, which can warp the plastic
Clean with a soft toothbrush and mild soap or a retainer cleaning tablet — not toothpaste (it is abrasive)
Store in a hard case when not in your mouth — most retainers are lost or damaged when left on a table or in a tissue
Keep away from heat sources, direct sunlight, and pets
Replace Essix retainers every 1–3 years or sooner if they crack, discolour, or become ill-fitting
Fixed vs removable: which is better?
Neither is universally superior — each has strengths that suit different situations. The gold standard for most patients is a combination: a fixed retainer on the lower arch (where crowding relapse is most common) plus an Essix retainer for the upper arch (worn nightly).
| Consideration | Fixed retainer wins | Removable retainer wins |
|---|---|---|
| Compliance required | No — always in place | Yes — must be worn consistently |
| Oral hygiene | Harder — needs threader | Easier — remove to brush/floss |
| Durability | 5–10+ years (if intact) | 1–3 years (Essix); 5+ years (Hawley) |
| Risk of failure | Wire may break silently | Forgotten or lost |
| Cost over 10 years | Low if maintained | Moderate (replacements) |
| Suitable for upper arch | Less common | Most common |