Most adults with mild to moderate crowding, spacing, or relapse after childhood braces are candidates for clear aligners. That covers a large share of the people who ask. The honest limits are worth knowing before you start: significant rotations, large vertical movements, and complex bite corrections are still handled more predictably with brackets. And the single largest factor in whether treatment works has nothing to do with your teeth — it is whether the aligners are in your mouth for enough hours a day.
- Mild to moderate crowding, spacing, and orthodontic relapse are well suited to aligners.
- Significant rotations, large vertical movements, and complex bite corrections favor braces.
- Wear time is the largest single variable in whether treatment succeeds.
- Gum disease must be treated before teeth are moved.
- Refinements and retainers should be discussed and priced before treatment begins, not afterwards.
What aligners handle well
Mild to moderate crowding — the most common adult case, handled as predictably as braces. Spacing and gaps — generally straightforward to close. Relapse after childhood orthodontics — extremely common, usually because retainers stopped being worn, and often shorter than the original treatment. And cases where gum health matters: adults with any periodontal history do meaningfully better with an appliance they can remove to clean properly.
Where braces still work better
Significant rotations, particularly of round-rooted teeth such as premolars; large vertical movements; complex skeletal bite discrepancies where the relationship between the jaws is the issue; and cases needing precise simultaneous control of many teeth. A dentist telling you braces would work better for your particular case is giving you accurate information, not losing a sale.
The factor that actually determines success
Wear time. Aligners are designed to be worn about 20 to 22 hours a day. At fourteen hours a day they do not work slowly — they stop tracking. The teeth fall behind the planned position, the next tray no longer fits, and treatment has to be re-planned or restarted. This is the most common reason a case runs long. If you know you will not wear them, braces are the better choice, since compliance stops being a variable at all.
Why gum health comes first
Moving teeth through inflamed or diseased supporting bone causes damage. If you have untreated gum disease, that is addressed before any aligner is made — not to increase the bill, but because teeth are held in place by bone, and moving them through a compromised foundation risks accelerating the loss of the very support that keeps them stable. Expect a periodontal examination as part of any responsible aligner consultation.
Why we treat both arches
We do not take single-arch aligner cases, and the reasoning is worth stating because it costs us cases. Your upper and lower teeth meet each other. Move one arch while leaving the other unchanged and you can straighten the teeth you were looking at while creating a bite that fits together worse than before — the teeth look better in the mirror and function worse in the mouth. If you have been quoted single-arch treatment elsewhere, that is worth a specific question: what happens to my bite?
What should be included in the fee
Refinements. Near the end of treatment, teeth rarely land exactly where the digital plan predicted, and a second short series of aligners corrects the remainder. Most cases need them, and our fee includes them from the start. Many practices bill them separately without raising it at the consultation. Retainers. Teeth drift throughout life; retention is permanent maintenance, not an accessory. Ask whether retainers are included and what replacements cost. Attachments and progress scans are part of normal treatment and should not appear as surprise line items.
A word about mail-order aligners
They cost less, and the reason is not efficiency — it is the absence of in-person diagnosis and monitoring. A remote provider cannot take radiographs to assess bone levels and root positions, diagnose gum disease before moving teeth, watch for root resorption during treatment, or notice when something is moving in a way it should not. For a genuinely simple case in a genuinely healthy mouth, mail-order treatment can work — but you cannot know which category you are in without the examination that mail-order treatment leaves out. If you are considering it, have an in-person examination first, even at a practice you do not intend to use.
Myth vs fact
- Myth: Clear aligners are just cosmetic. Fact: Aligner therapy is orthodontic treatment. It moves teeth through bone and requires diagnosis, planning, monitoring, and retention.
- Myth: The digital preview shows what will happen. Fact: The preview is a plan, not a guarantee. Biology does not always follow the animation, which is why refinements are normal.
- Myth: If I wear them most of the time, that is close enough. Fact: Tracking depends on consistent wear. Falling behind does not slow treatment — it derails it and requires re-planning.
- Myth: Retainers are optional once treatment finishes. Fact: Teeth drift for life. Retention is the maintenance phase of the treatment, not an add-on.
When to see a dentist
Arrange a visit if you have crowding, spacing, or teeth that have shifted since childhood braces; your bite has changed; you are considering mail-order aligners and want your gum health assessed first; or you have been quoted aligner treatment elsewhere and want the plan reviewed. Seek prompt care instead if you have bleeding gums, loose teeth, or pain — those need addressing before any tooth movement begins.
Summary
Most adults with mild to moderate crowding, spacing, or relapse are candidates for clear aligners. Braces remain the better tool for significant rotations, large vertical movements, and complex bite corrections. The factor that decides the outcome is wear time, and gum health decides whether treatment can begin at all. Before committing anywhere, ask what is included — specifically whether refinements and retainers are in the fee — and whether the plan treats one arch or both.