12 November 2026
Invisalign Attachments: What They Are and Why You Need Them
Written and clinically reviewed by Dr Shi Karim, Principal Dentist, GDC No. 82155. Published and last reviewed 12 November 2026.
Invisalign attachments are small, tooth-coloured bumps of composite (the same kind of filling material we use for bonding) that we stick onto some of your teeth before you start wearing aligners. They give the trays something to grip, so the plastic can push and turn teeth that it would otherwise just slide over. They don’t involve drilling, they’re removed at the end, and most people are surprised they can’t really see them.
That’s the short version. The longer one is below, in the order you’ll actually meet them.
If you’re still deciding whether clear aligners are for you at all, start with our Invisalign treatment page. This post assumes you’re past that point and a bit nervous about the bumps.
Why the trays need something to hold on to
A smooth, rounded tooth is a hard thing to push accurately with a thin sheet of plastic. Tipping a tooth forward is easy enough. Rotating a round premolar, pulling a tooth down into line or moving the root rather than just the crown is much harder, because the aligner has nothing to push against.
An attachment is a small ridge or wedge in exactly the right place. The aligner is made with a matching pocket, so when it clicks over the attachment the force goes where the plan says it should. Different shapes do different jobs, which is why your attachments won’t all look the same.
Not everyone needs them. A simple case with a couple of slightly crowded front teeth may need very few, or none. More complex movements usually need more. The number and position come from your treatment plan, not from a standard pattern.
Before attachment day
Your plan is built from a 3D scan of your teeth, which we take here at the practice. When the plan is designed, the software marks which teeth need attachments and what shape each one should be. You’ll often see them on the simulation we show you at the planning stage, so there are no surprises.
Two things I check before we place them:
- Your gums and existing fillings. Inflamed gums bleed easily and make bonding unreliable, so a hygiene visit sometimes comes first. If a tooth has a large old filling or a crown, we look at whether an attachment will bond to it properly.
- Your expectations. Patients sometimes picture a mouth full of metal. When I show them a tooth-coloured attachment on a model, the usual reaction is relief.
On the day: how attachments are fitted
This is usually one of the quicker appointments in the whole treatment.
- We clean and polish the teeth that need attachments.
- A mild gel is applied briefly to roughen the enamel surface on a microscopic level, then rinsed off. This is what lets the composite stick.
- A bonding agent is painted on.
- We fill a thin plastic template (made from your plan) with composite, seat it over your teeth and set the material with a blue curing light.
- The template comes off, leaving the attachments in exactly the right spots. We tidy any excess and check your bite.
- You try in your first aligners and we make sure they seat fully over every attachment.
There’s no drilling and you won’t normally need an injection. Most people describe it as like having a filling without the numb part. You’ll feel the template pressed on and the light, and that’s about it.
The first week with attachments
Your tongue will find them straight away. They feel bigger than they are, the same way a tiny chip feels like a crater. That usually settles within a few days as you get used to them.
The aligners also feel tighter with attachments than without, because they’re actually gripping. Getting the trays out is the bit that takes practice. I tell patients to start at the back molars on one side, ease the tray off with a fingertip, then work round. Don’t pull from the front teeth, and don’t use your nails on the edge of the plastic over and over.
What attachments look like to other people depends on where they are and how close someone stands. On the back teeth they’re rarely noticed. On the front teeth, people who know you well might spot them in good light, especially when the trays are out. In photos they’re hard to pick out. Patients often tell me they’re surprised they can’t really see them.
A few practical points:
- Food and drink. Take the aligners out to eat and drink anything other than plain water, as you would anyway. Attachments can pick up some staining from tea, coffee, red wine and curries, so brush before the trays go back in.
- Cleaning. Brush carefully around each attachment. Plaque likes to collect along the edges, and that’s where you’d see marks later.
- Hard foods. An attachment can occasionally come off if you bite into something very hard. Peeling an apple rather than biting into it is sensible.
If an attachment comes off
It happens now and then. Ring us. Don’t wait for your next check-in, because without the attachment the tray may not grip that tooth and it can start to fall behind the plan.
Keep wearing your aligners unless they no longer fit. We’ll re-bond it with the same template, which takes a few minutes. If one keeps coming off, I’ll look at why: often it’s a hard-food habit, sometimes it’s the tooth surface, occasionally the attachment needs a slightly different shape.
Refinements and new attachments
Teeth don’t always track the plan perfectly. Towards the end of the first set of aligners we often rescan and order refinement trays to finish the details, which I covered in how long Invisalign takes.
A refinement can mean changing attachments. Some get polished off, new ones get added in different spots, and some stay where they are. It’s a normal part of the process, not a sign anything has gone wrong.
At the end: removing attachments
Once your teeth are where we planned, we take the attachments off. We use a fine polishing bur to remove the composite until the surface is smooth, then polish the enamel. It’s quick, there’s no injection, and the main sensation is vibration.
Done carefully, removal leaves the tooth looking as it did, without the bump. Any very faint marks from staining around old attachment edges usually polish away. This is one reason I’m fussy about brushing during treatment.
Then come the retainers. The British Orthodontic Society is clear that retainers are needed after orthodontic treatment because teeth tend to move back. Attachments get the teeth there; retainers keep them there.
Can I have Invisalign without attachments?
Sometimes, yes. Very simple cases can occasionally be planned with few or no attachments. But if your plan includes rotations, moving teeth up or down, or controlling roots, refusing attachments usually means the aligners can’t do the job properly. Treatment can take longer or finish short of the result you wanted.
I’d rather tell you that honestly at the consultation than plan a case to avoid attachments and have it stall halfway. If attachments really put you off, we can talk about where they’d sit and whether a different approach suits you better. Our Invisalign vs braces guide covers the main alternatives, and our Invisalign FAQs deal with other everyday questions.
Seeing your plan before you commit
Your first visit is a free consultation with one of our treatment coordinators. If Invisalign looks suitable, we take a 3D scan and show you a simulation of the planned movement, including where attachments would go. Treatment always depends on a clinical assessment.
We’re a wholly private practice next to Cheadle Hulme station, about 15 minutes by train from Manchester city centre, with about 1,600 reviews from patients.
If you’re worried about how attachments will look at work, ask to see them on a model at your consultation. It’s a far better guide than any photo online.
Cheadle Hulme Dental & Cosmetics is a wholly private dental practice at 20A Station Road, Cheadle Hulme, SK8 7AB. Principal Dentist: Dr Shi Karim, GDC 82155. To book: contact us or call 0161 486 0743.
