Braces and Orthodontics in English: From Bracket to Retainer

Braces is always plural — I have braces, I got braces last year — and the singular a brace exists only in British usage, where it means a removable appliance. Then there is the pair everyone confuses: overbite is vertical, overjet is horizontal.

This list covers 84 terms: fixed appliance components, removable appliances and aligners, types of malocclusion, the biomechanics of tooth movement, and retention.

Who this is for

  • Patients — orthodontic treatment abroad, from assessment to retainer
  • Clinicians — describing an appliance and a treatment plan in English
  • Students — Angle's classification and biomechanics as examined

Word list to learn

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Word
braces ˈbreɪsɪz
fixed braces fɪkst ˈbreɪsɪz
fixed appliance fɪkst əˈplaɪəns
bracket ˈbrækɪt
metal bracket ˈmetəl ˈbrækɪt
ceramic bracket səˈræmɪk ˈbrækɪt
self-ligating bracket self ˈlaɪɡeɪtɪŋ ˈbrækɪt
lingual braces ˈlɪŋɡwəl ˈbreɪsɪz
archwire ˈɑːtʃwaɪə
nickel-titanium wire ˈnɪkəl taɪˈteɪniəm waɪə
stainless steel archwire ˌsteɪnləs stiːl ˈɑːtʃwaɪə
ligature ˈlɪɡətʃə
elastic ligature ɪˈlæstɪk ˈlɪɡətʃə
wire ligature waɪə ˈlɪɡətʃə
power chain ˈpaʊə tʃeɪn
molar band ˈməʊlə bænd
buccal tube ˈbʌkəl tjuːb
orthodontic bonding ˌɔːθəˈdɒntɪk ˈbɒndɪŋ
debonding diːˈbɒndɪŋ
separator ˈsepəreɪtə
spacer ˈspeɪsə
elastics ɪˈlæstɪks
intermaxillary elastics ˌɪntəmækˈsɪləri ɪˈlæstɪks
removable appliance rɪˈmuːvəbəl əˈplaɪəns
clear aligner klɪər əˈlaɪnə
aligner tray əˈlaɪnə treɪ
attachment əˈtætʃmənt
retainer rɪˈteɪnə
fixed retainer fɪkst rɪˈteɪnə
removable retainer rɪˈmuːvəbəl rɪˈteɪnə
Hawley retainer ˈhɔːli rɪˈteɪnə
vacuum-formed retainer ˈvækjuːm fɔːmd rɪˈteɪnə
palatal expander ˈpælətəl ɪkˈspændə
rapid maxillary expansion ˈræpɪd mækˈsɪləri ɪkˈspænʃən
headgear ˈhedɡɪə
facemask ˈfeɪsmɑːsk
functional appliance ˈfʌŋkʃənəl əˈplaɪəns
twin block appliance twɪn blɒk əˈplaɪəns
space maintainer speɪs meɪnˈteɪnə
bite plate baɪt pleɪt
malocclusion ˌmæləˈkluːʒən
occlusion əˈkluːʒən
centric occlusion ˈsentrɪk əˈkluːʒən
overbite ˈəʊvəbaɪt
deep bite diːp baɪt
overjet ˈəʊvədʒet
crossbite ˈkrɒsbaɪt
anterior crossbite ænˈtɪəriə ˈkrɒsbaɪt
posterior crossbite pɒˈstɪəriə ˈkrɒsbaɪt
open bite ˈəʊpən baɪt
underbite ˈʌndəbaɪt
edge-to-edge bite edʒ tə edʒ baɪt
Class I malocclusion klɑːs wʌn ˌmæləˈkluːʒən
Class II malocclusion klɑːs tuː ˌmæləˈkluːʒən
Class III malocclusion klɑːs θriː ˌmæləˈkluːʒən
crowding ˈkraʊdɪŋ
spacing ˈspeɪsɪŋ
diastema ˌdaɪəˈstiːmə
midline shift ˈmɪdlaɪn ʃɪft
rotated tooth rəʊˈteɪtɪd tuːθ
protrusion prəˈtruːʒən
retrusion rɪˈtruːʒən
tooth movement tuːθ ˈmuːvmənt
alignment əˈlaɪnmənt
levelling ˈlevəlɪŋ
tipping ˈtɪpɪŋ
torque tɔːk
intrusion ɪnˈtruːʒən
extrusion ɪkˈstruːʒən
anchorage ˈæŋkərɪdʒ
mini-screw ˈmɪni skruː
temporary anchorage device ˈtempərəri ˈæŋkərɪdʒ dɪˈvaɪs
orthodontic force ˌɔːθəˈdɒntɪk fɔːs
root resorption ruːt rɪˈzɔːpʃən
orthodontist ˌɔːθəˈdɒntɪst
orthodontic assessment ˌɔːθəˈdɒntɪk əˈsesmənt
cephalometric analysis ˌsefələˈmetrɪk əˈnæləsɪs
treatment duration ˈtriːtmənt djʊˈreɪʃən
adjustment appointment əˈdʒʌstmənt əˈpɔɪntmənt
tightening ˈtaɪtənɪŋ
archwire change ˈɑːtʃwaɪə tʃeɪndʒ
retention phase rɪˈtenʃən feɪz
relapse rɪˈlæps
orthodontic wax ˌɔːθəˈdɒntɪk wæks

Useful phrases

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Phrase
How long will I have to wear braces?
About eighteen months, depending on how the teeth move.
Your teeth will feel sore for a few days after each adjustment.
Avoid hard and sticky food while you have braces.
A wire is poking my cheek.
One of my brackets has come off.
Put a piece of wax over it until you can come in.
Wear your elastics twenty-two hours a day.
Aligners must be worn day and night, except when eating.
Take the aligners out before drinking anything hot.
Brush after every meal while wearing braces.
Today we are changing the archwire.
The braces come off next month.
You will need to wear a retainer afterwards, or the teeth will move back.

Braces or Aligners: The Orthodontic Consultation

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Patient
My front teeth are crowded and I've been putting this off for years.
Dentist
Let's have a look. You have moderate crowding in the lower arch and an increased overjet — a Class II malocclusion.
Patient
What are my options?
Dentist
Fixed braces or clear aligners. Both can correct this — they differ in visibility, cost and how disciplined you have to be.
Patient
How visible are fixed braces?
Dentist
We can use a ceramic bracket, which blends with the tooth colour. Lingual braces go behind the teeth and are not visible at all.
Patient
And the aligners?
Dentist
Almost invisible, but you must wear them 22 hours a day. If you don't, tooth movement simply stops.
Patient
How long would treatment take?
Dentist
Treatment duration in your case is around eighteen months, either way.
Patient
How often would I come in?
Dentist
Every six to eight weeks for an adjustment appointment — an archwire change with braces, or a new set of aligners.
Patient
Does the tightening hurt?
Dentist
The teeth feel tender for two or three days after each visit. Soft food helps, and orthodontic wax if a bracket rubs.
Patient
What happens when the braces come off?
Dentist
Debonding takes one appointment, and then the retention phase begins: a fixed retainer behind the front teeth plus a removable retainer at night.
Patient
For how long?
Dentist
Indefinitely, honestly. Teeth drift throughout life — retainers are what prevent relapse.

Common mistakes

Avoid these common mistakes

Wrong My daughter has a braces on her upper teeth.
Correct My daughter has braces on her upper teeth.

Braces is a plural-only noun in American English, like scissors or glasses: I have braces, my braces hurt, she got braces. Never a braces. British English additionally uses the singular a brace for the appliance as a whole — she wears a brace, a fixed brace, a removable brace — and then the verb agrees in the singular. Mixing the two produces a braces, which is wrong in both varieties.

Wrong I put braces two years ago and took them off last month.
Correct I got braces two years ago and had them taken off last month.

Patients get braces, or have braces fitted or put on — the causative have something done is the natural frame, because someone else performs the action: I had my braces fitted in March. Removal is have them taken off, or clinically debonding. From the clinician's side the verbs change: we fit the appliance, we bond the brackets, we debond at the end of treatment. Saying I put braces suggests you attached them yourself.

Wrong He has a large overbite — his upper teeth stick out by six millimetres.
Correct He has a large overjet — his upper teeth stick out by six millimetres.

These measure different planes. Overjet is horizontal — how far the upper incisors project in front of the lower ones, measured in millimetres. Overbite is vertical — how much of the lower incisors the uppers cover. Teeth that stick out are therefore an increased overjet; excessive vertical overlap is a deep bite. The reverse relationships are underbite, where the lower jaw sits forward, and open bite, where the front teeth do not meet at all.

Wrong The clinic offers Invisalign made by three different companies.
Correct The clinic offers clear aligners from three different companies.

Invisalign is a proprietary brand; the category is clear aligners, also called aligner therapy or removable aligner treatment. Using the brand generically is the same move as calling every vacuum cleaner a Hoover — understood, but imprecise, and in clinical writing or advertising it can create a real trademark problem. The associated vocabulary is generic: an aligner tray is one appliance in the series, attachments are the composite bumps bonded to the teeth, and refinement is a supplementary series at the end.

Wrong She wants to fix her curved teeth before the wedding.
Correct She wants to fix her crooked teeth before the wedding.

Crooked is the everyday word for teeth that are out of line; curved implies a smooth arc and is never used this way. The register runs from informal to clinical: crooked and gappy in conversation, crowded, spaced, rotated, protruding and misaligned in notes. A space between the front teeth is a gap informally and a diastema clinically. The verbs are straighten for patients and align for professionals.

About This List

Braces or brace: the commonest error

Braces names the fixed appliance and behaves like glasses or scissors — always plural. A braces is impossible, and I have a brace is not American English.

British usage adds the exception: a brace, singular, means a removable appliance — I wear a brace at night. The safest contrast everywhere is therefore fixed braces against removable appliance.

The slang term is train tracks. Taking them off is debonding — not removing.

Overbite and overjet: vertical and horizontal

The distinction that matters most:

  • overbite — how far the upper incisors overlap the lower ones vertically; an increased one is a deep bite
  • overjet — how far the upper incisors project horizontally

Open bite means no vertical contact at all, crossbite a reversed transverse relationship (anterior or posterior crossbite), underbite is the lay word for a reverse overjet, and edge-to-edge bite is exactly what it says.

Angle's classification describes the first molar relationship: Class I malocclusion is normal, Class II has the lower jaw back, Class III forward. The remaining descriptors: crowding, spacing, diastema, midline shift, rotated tooth, protrusion, retrusion.

What a fixed appliance is made of

  • bracket — metal, ceramic or self-ligating; placed on the tongue side they are lingual braces
  • archwire — nickel-titanium wire early, stainless steel archwire later
  • ligature holds the wire in: elastic or wire ligature, a run of them a power chain
  • molar band and buccal tube on the anchor teeth
  • separator and spacer before banding
  • elastics and intermaxillary elastics between the arches

Removable and alternative: clear aligner with its aligner tray and attachment, palatal expander with rapid maxillary expansion, headgear, facemask, functional appliance, twin block appliance, space maintainer, bite plate.

Biomechanics: tooth movement, alignment, levelling, tipping, torque, intrusion, extrusion, plus anchorage with a mini-screw or temporary anchorage device. The unwanted consequence is root resorption.

Retention: treatment does not end at debonding

After debonding comes the retention phase, and without it relapse follows — teeth drifting back. Retainer types: fixed retainer, removable retainer, Hawley retainer, vacuum-formed retainer.

Between visits: an adjustment appointment, which patients call tightening and clinicians record as an archwire change, plus orthodontic wax for rubbing. Planning: orthodontic assessment, cephalometric analysis, treatment duration.

Tighten, debond, elastics: patient word vs chart entry

  • Tighten is patient language; the clinical entry is archwire change or adjustment
  • Debond is the verb for removal; bond and bonding for placement
  • Aligner is the treatment appliance, retainer holds the result, mouthguard protects in sport — three different objects that look similar
  • Elastics are always plural; rubber bands is the patient word
  • Malocclusion is the condition; occlusion alone is neutral and can be normal
  • Brace as a verb means to prepare for impact and has nothing to do with teeth

Frequently Asked Questions

In American English, braces only — a plural-only noun like scissors: I have braces, my braces hurt. British English also allows the singular a brace for the whole appliance: she wears a fixed brace. What is wrong in both varieties is a braces. Note that a bracket is one individual attachment bonded to a tooth, not the whole appliance.

Overjet is horizontal — how far the upper incisors sit in front of the lower ones, recorded in millimetres. Overbite is vertical — how much of the lower incisors they cover. Protruding front teeth are an increased overjet; excessive vertical overlap is a deep bite. The opposites are underbite, with the lower jaw forward, and open bite, where the front teeth never meet.

Braces is the whole fixed appliance. A bracket is one small attachment bonded to a single tooth; the archwire runs through the brackets and does the actual moving, held by ligatures, power chains or, in a self-ligating bracket, by a built-in clip. Molar bands are metal rings cemented round back teeth. Confusing the two is common because several languages use the loanword brackets for the whole appliance.

Clear aligners is the generic term and the safe one; Invisalign is a single manufacturer's brand. Using it generically is the Hoover problem — understood but imprecise, and in advertising it raises trademark issues. Related generic vocabulary: an aligner tray is one appliance in the series, attachments are the bonded composite bumps, and refinement is a supplementary series at the end of treatment.

A retainer holds teeth in their new position once active treatment ends — the retention phase. Types include the fixed retainer bonded behind the teeth, the removable Hawley retainer with an acrylic baseplate, and the clear vacuum-formed retainer. Retention is not optional: without it teeth drift back, which is called relapse, and for many patients retention is lifelong.

They describe the anteroposterior relationship of the arches. Class I has a normal molar relationship with local problems such as crowding or spacing. Class II has the lower arch positioned back relative to the upper, typically presenting with an increased overjet. Class III has the lower arch forward, producing an underbite. The classification guides whether treatment is purely dental or needs growth modification or surgery.

The appliance is reactivated: an archwire change, tightening, and replacement of ligatures or power chains, usually every four to eight weeks. Mild soreness for a day or two afterwards is expected — patients say it feels tender. Progress is measured against the planned tooth movement, and the overall treatment duration is typically eighteen to thirty months for fixed appliances.

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