A lot of adults assume the decision is already made for them: braces are for teenagers, aligners are for grown-ups. In practice, plenty of adults wear fixed braces, and plenty of teenagers wear aligners. The better question is which appliance suits the movement your teeth need and the way your week actually runs.
Adults also bring things to orthodontic treatment that a 13-year-old usually does not: older fillings and crowns, some gum recession, perhaps a tooth or two already missing, and a job that involves talking to people all day. Those details often decide the matter more than appearance does.
Gum health and existing dental work come first
Teeth can be moved at almost any age, but only when the gums and supporting bone are healthy. Moving teeth through inflamed gums or active periodontal disease can speed up bone loss, so any gum problem is treated and stabilised before either braces or aligners are started. Adults with a history of gum disease can often still have orthodontic treatment, with closer monitoring.
Existing restorations matter too. Brackets bond reliably to natural enamel but less predictably to porcelain crowns or large composite fillings, which may need special bonding techniques. Aligners avoid that issue for the most part, although attachments still need a suitable surface. Implants cannot be moved by orthodontics, teeth joined in a bridge move only as a unit, and gaps left by missing teeth change how the remaining teeth can be shifted, which shapes what either appliance can achieve. Our article on aligners when teeth are missing covers this in more detail.
Some movements still favour fixed braces
Brackets and wires apply force continuously and give the clinician fine control over the root as well as the crown of each tooth. That control is useful for severe crowding, closing large spaces where roots need to move in parallel, substantial bite corrections, and teeth that need to be pulled down or pushed up in the socket. A 2019 review comparing the two (Ke and colleagues, BMC Oral Health) found both were effective, but aligners were less effective than braces at controlling root angle and producing good contact between the back teeth.
Aligners have improved considerably and now handle many moderate cases well, especially with attachments. They are commonly used for mild to moderate crowding or spacing, and for adults whose teeth have drifted after braces they wore years ago. For harder movements, aligners may still work but can need more refinements and a longer timeline. Some complex adult bites are best assessed by a registered specialist orthodontist, and where a jaw discrepancy is involved, jaw surgery may be part of the discussion.
Your working week shapes what you will tolerate
Aligners come out. You can remove them for a presentation, a wedding or a long dinner, and you brush and floss normally. Many adults like that they are hard to spot in a meeting or on a video call. Food is not restricted, because the trays are out while you eat.
That freedom has a cost in routine. Every meal, coffee or sweet drink means taking trays out, cleaning your teeth if you can, and putting them back. People who graze through the day, or drink coffee or tea at their desk for hours, often find aligners harder to live with than they expected.
Braces stay put. There is nothing to remember, nothing to lose, and the teeth are being moved every hour of the day. The trade-offs are visibility, a list of foods to avoid (hard, sticky and chewy foods can break brackets), more effort cleaning around wires, and some rubbing on the cheeks and lips for the first week or two. Tooth-coloured ceramic brackets can reduce how noticeable braces are, although they are a little bulkier than metal.
Discipline is the hidden part of aligner treatment
Aligners only move teeth while they are being worn, and they are designed to be in almost all day and night, coming out only to eat, drink anything other than water, and clean your teeth. Your dentist will give you the exact wear time for your plan. An adult who is consistent will usually do well. An adult who regularly forgets trays after lunch, or leaves them out on weekends, may find treatment stalls and takes longer. If you already know you struggle with routines like retainer wear or daily flossing, fixed braces may be the more realistic choice. That is not a criticism, simply a practical way to choose.
Timeframes and fees overlap more than people expect
Treatment time depends mainly on how far teeth need to move. A mild case with aligners might take well under a year, while a complex case in braces can take two years or more. A complex case in aligners can take longer than a mild case in braces, so the appliance alone does not predict the timeline.
Cost works the same way. In the Australian market, the fee ranges for braces and clear aligners overlap substantially, and the complexity of your case usually matters more than which appliance is used. Our braces and Invisalign cost comparison breaks this down further.
Retention lasts longer than treatment
Whichever appliance you choose, teeth tend to drift once it comes off, and adults are no exception. Retainers are part of the plan from the beginning. Our articles on getting your braces off, retainer types and how long to wear them, life with a retainer and fixed or removable retainers explain what that stage involves.
Questions we hear from adult patients
Am I too old to straighten my teeth?
There is no upper age limit. What matters is that your gums and bone are healthy enough to support tooth movement, and that is checked at the assessment.
Which one hurts less?
On average, studies report a little less pain with aligners, mainly in the early weeks, and many people find them less irritating day to day because there are no brackets or wires against the cheeks. Both cause some pressure and tenderness as teeth move, usually for a day or two after a new tray or a braces adjustment.
Can I start with one and change to the other?
Sometimes. A case that is not progressing well in aligners can occasionally be finished with braces, or a short period of braces may be used for a difficult movement before aligners. This is decided case by case.
An examination with X-rays and a scan is the most reliable way to see which option fits your teeth and your routine. You can check our current deals, including free consults for braces and aligner treatment, or visit our general dentistry page to book.
This article is general information and does not replace an individual dental assessment.
