What Are Spacers for Teeth? The Complete Guide to Orthodontic Separators

Here is the thing most people get wrong on day one: spacers are not your braces. They are not glued on, they are not permanent, and nothing about them means your case is unusual. They are a short preparation step, and they come out before the real appliance goes on.

The American Association of Orthodontists defines a separator as "an elastic o-ring or small wire loop placed between the teeth to create space for placement of orthodontic bands" (via the AAO Glossary of Orthodontic Terms).

Physically, they are tiny. A rubber spacer is a small elastic ring, roughly the size of a small rubber washer, made of an elastomeric material (a stretchy medical-grade rubber). Metal ones are stainless steel. Your orthodontist places between two and eight of them, depending on how many bands your plan calls for.

What they do is simple and slow. They apply steady pressure that moves each tooth a fraction of a millimeter at a time, which works because of the periodontal ligament (the soft cushion that holds each tooth in the bone). That is the whole job: two weeks of quiet pressure so your metal braces treatment can start on schedule.

Your back molars do the heaviest work in your mouth, so the anchor for braces on those teeth usually has to be stronger than a bracket glued to one surface.

That anchor is a band, which the AAO describes as "a metal ring, usually on a back tooth, that is cemented to a tooth for strength and anchorage" (via the AAO Glossary of Orthodontic Terms). It wraps the whole tooth rather than sitting on one face of it.

And there is the problem. Neighboring teeth already touch each other at what dentists call the contact point. A molar band is thin, but not thin enough to slide between two teeth that are already pressed together.

So you have three ways to solve it. Force the band into place, which hurts. Shave a sliver of enamel, which you cannot undo. Or spend two weeks letting a small elastic do the work. Spacers are the third option, so nothing gets cut, filed, or forced. And needing them is routine, not a signal that your bite is complicated or that your treatment will take longer.

There are three types of ortho separators, and which one you get depends mostly on how tightly your molars are pressed together.

Rubber (elastomeric) spacers

These are the ones most people get. They look like tiny donuts, usually blue or another bright color, and your orthodontist stretches them open with two pieces of floss or a small separating tool before sliding them into place.

They go in fast, they have no sharp edges, and they come out easily. In one comparative study, elastomeric separators also opened significantly more space than spring separators did (PMC5184389).

The downside is that they can work themselves loose once the gap has opened. Worth saying plainly: a rubber spacer that falls out near the end of your two weeks often means it worked, not that it failed. Colgate puts the standard timeline at one to two weeks before your braces are fitted.

Brass wire separators

Brass wire is the least common of the three. Some orthodontists pass a soft brass wire around the contact point and twist it closed, then tighten it at follow-up visits. It is chosen for extremely tight contacts, or when separation needs to happen gradually over several weeks. You are unlikely to see one today, but it is still part of the toolkit.

No numbing. No needles. No drilling. The appointment is short enough that the trip there usually takes longer than the visit itself.

Here is how it goes:

1. Sit back in the chair. Nothing is injected, cut, or drilled.
2. Watch the orthodontist stretch the elastic open with two pieces of floss or a small separating tool.
3. Feel firm pressure as the spacer slides past the contact point and settles between your molars.
4. Repeat for each spot that needs one, usually between two and eight.
5. Walk out. Most spacer appointments are short.

The moment itself is the part people brace for. You feel firm pressure building, then a small pop as the spacer clears the contact point and drops into place. That is it. No sharp pain, and again, no anesthetic, because none is needed.

Spacers cause pressure and soreness, not sharp pain, and by the end of the week most people forget they are there. We can be more specific than "a few days," because researchers have measured it. A 2016 cross-sectional study of 30 adolescent patients tracked pain day by day after elastomeric and spring separators were placed. Pain began about four hours after placement, peaked on day one, continued through the third day, then declined, reaching its lowest point by the seventh day (Pain and distress induced by elastomeric and spring separators, PMID 28032047).

Mapped onto your week, it looks roughly like this:

• Hours 0 to 2. Pressure, plus the odd sensation that food is stuck between your back teeth. It is not food. It is the spacer.
• Hours 4 to 24. The peak. A dull ache when you bite down, and back teeth that feel tender when you chew.
• Days 2 to 3. Still noticeable, but easing.
• Day 4 and after. Most people stop thinking about them.

Thirty patients is a small study, so treat those hours as a shape rather than a schedule. Healthline reports a similar pattern, describing the first two days as the worst. Most patients describe spacer soreness as similar to, or milder than, the first adjustment after braces go on.

One line to hold on to: soreness that gets worse after day three, or pain that is sharp and stabbing rather than dull, is not what you should expect. Call your orthodontist if that happens.

One to two weeks, and sometimes just a few days. That is the honest answer for most patients, and both Colgate and Healthline put the standard range in the same place.

Two things move the number. How tightly your molars are pressed together, because a very tight contact takes longer to open. And scheduling: your spacers stay in until your band appointment, so the date on your calendar sets the end point as much as your biology does.

You never take them out yourself. Not to eat, not to sleep, not because they are annoying on day two. Your orthodontist removes them at the next visit, and it takes seconds.

Leaving them in longer than planned is not a good idea either, because the elastic traps plaque against the gum. If your appointment gets pushed back more than a few days, call and ask what to do.

For a week or two, eat like your back teeth are on a break. Two lists cover almost every decision you will make.

The reasoning matters more than the lists, because it lets you judge a food nobody put on either one. Sticky foods grip the elastic and pull it straight out. Hard foods can shift a spacer out of position even without removing it. Sugary drinks are a slower problem: plaque builds up around the elastic where your brush cannot reach well.

One practical trick nobody mentions: cut fruit and meat into small pieces and chew with your premolars, the teeth just in front of your molars. You eat normally, and the sore teeth do less work.

Once your braces are on, the rules change again. Our guide to what to eat with braces covers that first week.

Brush side to side over the spacer, not up and down. That is the one instruction that changes.

Colgate explains why: "brush your teeth back and forth as opposed to up and down, as an up and down motion can cause the spacers to come out" (Colgate). A vertical sweep catches the edge of the elastic and lifts it.

Everything else stays the same. Soft bristles, fluoride toothpaste, twice a day. Do not floss between the two teeth holding a spacer. Floss the rest of your mouth normally, and use an interdental brush or a water flosser in the areas that are free.

Rinse with water after meals, because the elastic traps food and plaque against the gum line. These habits carry straight over, so it is worth reading up on brushing with braces and flossing with braces before your next appointment.

This is common, and it often means the spacer already did its job. Do not panic, and do not put it back in yourself.

What to do depends on your timing:

• Your band appointment is a day or two away. Call and let the office know. They may simply leave it out, since the space is likely already open.
• Your appointment is further off. Call anyway. Healthline notes that you may need a replacement, or your orthodontist may decide you already have enough space (Healthline). They will tell you which.
• You swallowed it. Call your orthodontist so they know, and mention it at your next visit.

Never reinsert a spacer at home. Getting it back to the right depth takes a tool and a trained hand, and forcing it can irritate the gum.

Diamond Braces has 65+ locations across NY, NJ, PA, and CT, so there is usually an office nearby to call. Find an office near you.

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Spacers are not billed separately. They are included in the total cost of your braces treatment.

What you are really asking is what braces cost. In the wider market, metal braces run $3,000 to $7,000 depending on case complexity and where you live. Healthline puts comprehensive treatment at about $5,000 to about $7,000. At Diamond Braces, pricing is set by treatment length:

Every band comes out to as low as $99/month with insurance, with $0 down through financing plans. X-rays and an iTero digital scan are included, along with up to two Essix retainers and eligibility for the Lifetime Smile Guarantee.

Your spacers live inside that number, and so do the appointments where they go in and come out. One thing that genuinely is billed on its own: a pediatric space maintainer, a different appliance with its own dental code starting at D1510.

At your band appointment, the orthodontist removes each spacer with a small explorer instrument in seconds. It is faster and less uncomfortable than putting them in, which surprises most people.

Then the real work starts. Your orthodontist tries the correctly sized band on each molar, cements it in place, and fits the rest of the appliance. Plan for a longer appointment than the spacer visit.

Expect your teeth to feel tender again for a couple of days afterward, much the way they did after the spacers went in. You already know what that feels like, and you already know it passes.

Which is a decent way to think about the whole thing. Spacers are not an obstacle standing between you and treatment. They are the first day of it.