Clear Aligners vs Braces: How to Choose Without the Sales Pitch

How each system actually moves a tooth

Teeth move because sustained light pressure remodels the bone around the root: bone dissolves on the side being pushed towards and rebuilds on the side being pulled away from. Force that is too heavy stalls that process rather than speeding it up, which is why every orthodontic system is a study in patience.

Fixed braces

A bracket bonded to each tooth is connected by an archwire. The wire, not the bracket, supplies the force, and the sequence runs from flexible nickel-titanium wires that level a crooked arch to rigid stainless steel wires that hold a finished shape. Because brackets grip the tooth in three dimensions, the wire can rotate a tooth, tip its crown and torque its root independently, and it does all of that twenty-four hours a day whether you are thinking about it or not.

Clear aligners

A series of thermoformed plastic trays is worn for one to two weeks each, and every tray is shaped slightly differently from the teeth it sits over. The tray tries to return to its moulded shape, and that mismatch, usually a fraction of a millimetre per stage, is the force. Because the plastic can only push against the crown surfaces it can reach, controlling the root and pulling a tooth downwards are the movements that need the most engineering, which is where attachments come in.

What each system is good at

Where aligners do well

Mild to moderate crowding, closing spaces and gaps, tipping teeth upright, modest arch expansion, and relapse after earlier orthodontics are the bread and butter of aligner treatment. They suit adults who cannot spend a year in visible metal, and there are no loose brackets or poking wires to generate emergency visits. They also come out, which matters for wind instrument players, contact sports and a wedding photograph.

Where fixed braces still win

Large rotations of round-rooted teeth such as premolars and canines, extrusion, closing extraction spaces, correcting a significant bite discrepancy, bringing an impacted canine into the arch, and growing patients who need a functional appliance all favour fixed appliances. So does any case where honest self-assessment says the trays will not be worn. Skill and case selection matter more than brand: a complex case planned badly will disappoint in either system.

The aligner is not the treatment. The diagnosis is the treatment. The plastic is only how the plan gets delivered.

The twenty-to-twenty-two-hour problem

This is the number that decides most aligner outcomes, and it is the one most people underestimate. Twenty to twenty-two hours a day means the trays are out for meals and for brushing, and in for everything else, including the cup of coffee and the long phone call. Anything other than water taken with trays in also puts sugar or acid in contact with enamel and holds it there.

The failure mode is quiet. Teeth stop keeping pace with the plan, the next tray does not seat fully at the back, and the gap between plan and mouth widens invisibly for weeks. The fix is a refinement: new scans, a new series of trays, and commonly another two to six months. Refinements are normal rather than a sign of failure, but the ones caused by wear time are avoidable.

• Track wear honestly for the first two weeks before you decide you are a compliant wearer.
• Change trays at night, so the sorest hours are spent asleep.
• Keep the previous tray until the new one seats fully, as a fallback.
• Carry a case; trays wrapped in a napkin end up in the bin, and replacements cost money and time.

Attachments and enamel filing, the parts people are surprised by

Two details rarely feature in the advertising and both surprise people at the fitting appointment.

Attachments

Small tooth-coloured composite bumps are bonded to selected teeth to give the plastic something to grip, making rotation and extrusion possible. They stay for the whole treatment and are polished off at the end. They are discreet rather than invisible, which is worth knowing before you choose aligners specifically for their invisibility.

Interproximal reduction

IPR is the controlled filing of a few tenths of a millimetre of enamel between teeth to create the space crowding needs. Done within accepted limits it is regarded as safe, and the enamel removed is a small fraction of what sits on the contact surfaces. It is also irreversible, so it belongs in a conversation before the first tray, not as a surprise in month three. Ask how much is planned, on which teeth, and why extraction or expansion was not chosen instead.

Hygiene, decay risk and gum health

Aligners have a genuine advantage here and it is easy to squander. Because they come out, you brush and clean between your teeth exactly as you did before, with nothing to work around. Fixed braces make that harder: brackets create dozens of new sheltered corners, and white spot lesions, the chalky demineralised patches sometimes revealed when brackets come off, are a well-recognised complication rather than a rare accident.

The aligner trap is different. A tray is a reservoir. Anything sweet or acidic drunk with trays in is held against enamel for hours, and dry mouth under full-time wear reduces the saliva that would normally buffer it. Either way, fluoride toothpaste, interdental cleaning and not rinsing after brushing do most of the protective work. Our daily oral care routine sets out the technique, and gum disease explains the bleeding that should never be treated as normal during treatment.

One footnote people ask about constantly: aligner trays are not whitening trays, and peroxide gel worn under a tray that was not designed for it is a good way to produce sensitivity. The mechanics of that are covered in our teeth whitening guide.

Treatment time, appointments and what it costs

Ranges, not promises. Simple aligner cases commonly run six to eighteen months, comprehensive ones eighteen to thirty. Fixed braces typically run twelve to twenty-four months and can reach thirty-six in complex or extraction cases. Aligner reviews fall every six to twelve weeks, sometimes with remote check-ins between; braces need chairside adjustments every four to eight weeks, and an occasional unscheduled visit for a debonded bracket.

Fees vary by country, city and complexity more than by system. The bands below are broad private-fee ranges for comprehensive treatment, and a short cosmetic case that only straightens the front teeth sits well below them.

What GlaadBlog.org tells readers about mail-order aligners

Direct-to-consumer aligners are cheaper for an honest reason: the clinical assessment has been removed from the price. The trays themselves may be manufactured perfectly well. What is missing is everybody who would normally look before force is applied to teeth, and orthodontic force applied to an undiagnosed mouth is where the harm sits.

Moving teeth through bone that has already been lost to untreated periodontitis can accelerate that loss. Short or previously resorbed roots need to be known about. Impacted and unerupted teeth, retained baby teeth and untreated decay all change the plan. A home impression kit detects none of this, and there is nobody in the room to notice when a tooth stops tracking. Professional bodies including the American Dental Association have raised consumer-safety concerns about remote-only models, and the U.S. Food and Drug Administration regulates these devices and has published safety communications about their use.

What a proper orthodontic assessment includes

1. Radiographs, usually a panoramic view, to check roots, bone levels and unerupted teeth.
2. A periodontal examination, with pocket depths recorded, before any force is planned.
3. A decay check, because active caries is treated first.
4. A bite assessment in three dimensions, not a photograph of the front six teeth.
5. A written plan naming the clinician responsible, with a stated position on refinements.
6. Scheduled in-person reviews, and a way to be seen when something stops fitting.

Retainers are permanent, whichever route you take

This is the part almost nobody is told clearly enough. Teeth drift for life. The fibres around a rotated tooth remember their old position for years, and jaws keep changing subtly into middle age. Retention is not an optional extra at the end of treatment, it is the rest of treatment.

In practice that means a removable retainer worn nightly and indefinitely, a fine wire bonded behind the front teeth, or both. Bonded retainers are quietly effective and need checking, because a wire that has partly debonded can move a tooth in a direction nobody intended. Relapse, not treatment failure, is the most common long-term disappointment in orthodontics, and it is almost entirely preventable.

If you are weighing straightening against other work, read the dental implants guide too, since implants do not move with the rest of the arch and the sequencing of the two matters. The rest of the library is at GlaadBlog.org guides, and our about page explains who writes and reviews it.