Can Invisalign Fix Gaps Between Teeth?

Gaps between teeth — known clinically as diastema — are one of the most common reasons adults seek orthodontic treatment. The good news is that Invisalign is particularly effective for this type of case. Spacing cases are among the most predictable outcomes in clear aligner therapy, with clinical studies reporting success rates above 95 per cent for gaps up to 6 mm.

At Townsville Dental Clinic, gap closure with Invisalign is one of our most frequently requested treatments. Many patients achieve complete closure in under 12 months with minimal disruption to their daily routine.

How Does Invisalign Close Gaps?

Invisalign uses a series of custom-moulded thermoplastic aligners, each slightly different from the last, to apply gentle, continuous pressure that moves teeth into their planned positions. For gap closure, the aligners work by:

Bodily movement — shifting the entire tooth (crown and root) towards the gap
Tipping — angling the crown inward as an initial movement, followed by root correction
Attachments — small tooth-coloured bumps bonded to specific teeth that give the aligner additional grip for more controlled movement

Each set of aligners is worn for 7 to 14 days before progressing to the next set. The total number of aligners depends on the gap size and any additional alignment needed.

Treatment Timeline by Gap Size

Gap Size	Estimated Duration	Number of Aligners
1–2 mm	3–6 months	7–14 sets
3–4 mm	6–9 months	14–22 sets
5–6 mm	9–12 months	22–30 sets
>6 mm	12+ months or combination treatment	30+ sets

These estimates assume 20–22 hours of daily wear and no complicating factors. If additional issues such as crowding, rotation, or bite correction are present, treatment time increases accordingly.

When Might Invisalign Not Be Enough for Gaps?

While Invisalign handles most spacing cases effectively, certain situations may require a different approach:

Gaps larger than 6 mm — may need traditional braces or a combination of orthodontics and restorative work
Gaps caused by missing teeth — if a tooth is absent, closing the gap orthodontically may not be ideal; an implant or bridge might better restore function
Gaps caused by an oversized frenum — a frenectomy (minor surgical procedure) may be needed before or during orthodontic treatment to prevent the gap from reopening
Severe periodontal disease — gum disease must be stabilised before any orthodontic force is applied

During your consultation at Townsville Dental Clinic, we assess the cause and size of the gap, take digital scans, and show you a projected treatment outcome using Invisalign’s ClinCheck software before you commit to treatment.

Preventing Gaps from Returning

Retention is critical after any gap closure treatment. Without a retainer, teeth have a natural tendency to drift back towards their original positions — a process called orthodontic relapse. Options include:

Removable retainer — worn nightly, custom-fitted from your final aligner scan
Bonded retainer — a thin wire permanently fixed behind the front teeth, invisible from the outside

Most orthodontists recommend a bonded retainer for gap closure cases specifically, as diastema has a higher relapse rate than other orthodontic conditions.