Complete guide to Invisalign treatment, support and aftercare at your dental practice

Complete guide to Invisalign treatment, support and aftercare at your dental practice

Invisalign is a removable clear aligner system that straightens teeth using a series of custom-moulded plastic trays, replacing traditional fixed braces. A full course of treatment at a dental practice typically spans 6 to 18 months and includes an initial consultation, active aligner wear, and a structured aftercare phase to maintain results.

Key takeaways

• Invisalign aligners are worn for 20–22 hours per day and changed every 1–2 weeks throughout treatment.
• A full Invisalign course at a London dental practice typically costs between £2,500 and £5,500 depending on case complexity.
• Treatment length averages 12 months for moderate misalignment; mild cases (Invisalign Lite) can complete in as few as 3–6 months.
• Retainers must be worn after treatment ends — typically nightly — to prevent teeth from drifting back.
• At Battersea Smiles, more than 80% of patients require refinement aligners at some stage, a normal part of the Invisalign process rather than a sign of failure.

What is Invisalign?

Invisalign is a system of removable thermoplastic aligners manufactured by Align Technology. Each aligner is trimmed to the gumline and exerts controlled, graduated pressure on specific teeth to shift them incrementally. The system was cleared by the US FDA in 1998 and is now used in over 100 countries.

Aligners are fabricated from SmartTrack material, a multi-layer polyurethane resin proprietary to Align Technology. This material provides a consistent force level throughout each wear cycle, which is why switching to a new tray every one to two weeks produces predictable tooth movement.

How does Invisalign treatment work?

Treatment begins with a 3D intraoral scan, often taken using an iTero scanner, which captures a precise digital impression of the teeth and bite. The scan feeds into Align Technology’s ClinCheck software, which generates a virtual treatment plan showing each planned tooth movement from start to finish.

The dentist reviews and adjusts the ClinCheck plan before approving it for manufacture. Once aligners are produced, patients collect their first set of trays and receive clear instructions on wear time, insertion and removal. Compliance with the 20–22 hour daily wear requirement is the single biggest variable affecting treatment duration.

Small tooth-coloured composite attachments are sometimes bonded to individual teeth. These attachments act as anchor points, allowing the aligner to exert force in directions that would otherwise be difficult — such as rotating a canine or intruding a molar.

Invisalign vs traditional fixed braces

Fixed braces work continuously because they are bonded to teeth and cannot be removed. Invisalign places responsibility on the patient; consistently wearing aligners for fewer than 20 hours per day will extend treatment time and may compromise the final result.

How much does Invisalign cost and how long does it take?

Invisalign Full at a dentist London typically costs between £3,500 and £5,500 in 2026. Invisalign Lite, suited to mild cases, starts from approximately £2,500. These figures usually include the iTero scan, all aligner stages, refinements if needed, and one set of retainers.

Treatment duration depends on the degree of misalignment. Invisalign Lite cases resolve in 3–6 months. Invisalign Full cases average 12–18 months. At Battersea Smiles, patients are seen for progress checks approximately every 6–8 weeks to assess tooth movement and issue the next set of trays.

What does Invisalign aftercare involve?

Aftercare is the phase that determines whether results last. Without a retainer programme, teeth begin shifting within weeks of treatment ending, a process called relapse.

Retainers

Two retainer types are used after Invisalign. Removable Vivera retainers — manufactured by Align Technology from the same SmartTrack material as aligners — are worn nightly. Fixed bonded retainers are thin wires bonded to the back surfaces of the front teeth, providing continuous passive retention without patient compliance.

Most practitioners recommend wearing a removable retainer every night indefinitely, not merely for six months. Teeth remain under light biological pressure from the surrounding periodontal ligament throughout life, which means retention must be ongoing.

Oral hygiene during and after treatment

Aligners must be removed before eating or drinking anything other than plain water. Food debris trapped beneath an aligner creates a warm, acid-rich environment that accelerates enamel demineralisation. Teeth should be brushed and flossed before reinserting aligners after every meal.

After treatment ends, the hygiene principles remain the same. Retainers should be cleaned daily with a soft brush and cold water; hot water warps the plastic.

Common mistakes patients make during Invisalign treatment

1. Removing aligners for social events and failing to account for the cumulative lost hours across a week.
2. Skipping progress appointments, which delays identification of tracking issues before they worsen.
3. Moving to the next aligner before the current tray fits fully flush — the back teeth are the most common sticking point.
4. Neglecting retainer wear after active treatment ends, resulting in partial relapse within 3–6 months.
5. Cleaning aligners with toothpaste, which is abrasive and causes micro-scratching that makes trays visibly cloudy.

Frequently Asked Questions

Is Invisalign suitable for all orthodontic cases?
Invisalign treats most mild to moderate alignment issues, including crowding, spacing, overbite, underbite and crossbite. Severe skeletal discrepancies may require fixed appliances or surgical intervention; a dentist will confirm suitability after reviewing a full intraoral scan and X-rays.

Does Invisalign hurt?
Most patients experience pressure and mild discomfort for 24–48 hours after switching to a new aligner tray. This is the normal sensation of teeth moving under controlled force. Over-the-counter analgesics such as paracetamol or ibuprofen are sufficient for relief if needed.

Can I eat and drink with Invisalign aligners in?
Aligners must be removed before eating any food and before drinking anything other than plain, still water. Hot drinks warp the plastic; sugary or acidic drinks pooling beneath the aligner significantly increase the risk of tooth decay.

How often will I need to visit the practice during treatment?
Progress appointments are typically scheduled every 6–8 weeks. At each visit the dentist checks that teeth are tracking correctly against the ClinCheck plan and provides the next batch of aligner trays.

What happens if I lose or damage an aligner?
Contact your practice immediately. The standard advice is to wear the previous tray until a replacement is issued, which prevents teeth from drifting. Replacement aligners can usually be ordered from Align Technology within 1–2 weeks.

How long do retainers last after Invisalign?
Vivera retainers typically last 1–3 years with nightly use before they need replacing. Fixed bonded retainers can last 5–10 years but require annual checks by a dentist to confirm the wire bond remains intact.