Nighttime aligners

There is no good evidence yet that night-only aligners move teeth as reliably as aligners worn most of the day. A night-only plan asks for a block of about 8 to 10 hours, against the 20 to 22 hours a day Invisalign asks for full-time treatment. The companies that sell night plans say treatment takes longer than their day plans, and most limit them to milder cases. A registered trial comparing the two schedules stopped early with seven people enrolled and has not reported a comparison. So a night plan is a company's offer for its own product, not a proven equivalent of full-time wear.

Why the evidence does not settle it

To show that two schedules work equally well, a study has to treat enough people on each, follow them to the end of treatment, and measure how close the teeth came to the plan. The study registered as NCT06539676 set out to compare aligners worn 10 to 12 hours a day with aligners worn 20 to 22 hours. ClinicalTrials.gov lists it as terminated at the sponsor's decision, with 7 people enrolled, starting in September 2024 and ending in January 2025. A study of that size, stopped early and without published results, cannot show whether the shorter schedule works as well or not.

That leaves company estimates. They describe each company's own cases, which it chooses, and its own definition of a finished result.

What the night plans say

These figures were checked on the companies' pages on October 22, 2026, for both arches. Smileie and AlignerCo showed only sale prices and NewSmile a limited-time offer price, so their prices are not given here. Prices change often, so check before you pay.

Every night plan is quoted as taking longer than the same company's day plan, and every night plan with a confirmed price costs more. Smileie's pricing page says its day and night plans "reach the exact same result". No published trial supports that claim. Two companies give different hours or months on different pages, so ask which figures apply to your plan, in writing, before paying.

Ten hours is more than a night's sleep

A 10-hour block runs past most people's sleep. If you sleep seven hours, the trays go in about three hours before bed, which usually means finishing dinner and brushing early in the evening. NewSmile says its night aligners should not be removed during that block. Ask the provider what you can drink during those hours, because full-time aligner wearers are told to take trays out for anything except water.

If a night plan is chosen because daytime wear feels too hard, that evening block is the part to plan around. Unless you sleep at least 8 to 10 hours, wearing trays only while asleep is less than these companies ask for.

Questions the evidence has not answered

• Do teeth reach the planned position as often on night-only wear?
• Do they drift back during the day, and does that matter by the end?
• Are more refinement trays needed, and who pays for them?
• Which bites are suitable, and who decides that from impressions alone?
• What retainer plan follows, and is it included?

A clinician who has examined your teeth is the person to ask whether a reduced-wear plan suits your case.

Examination before starting

On December 14, 2023, the American Association of Orthodontists said an in-person examination and appropriate X-rays are critical before orthodontic treatment. It said so after SmileDirectClub closed and applied the point to other mail-order treatment. Impressions and photographs record the teeth and the visible bite. They do not show roots, bone or gum health. None of the four night plans above lists a dentist's examination as a requirement before starting. Whether a bite is suitable for aligners at all is covered in what clear aligners can and cannot fix, and how clinic treatment differs from remote treatment in Invisalign and at-home aligners.

Who might consider a night plan

The usual reasons are not wanting trays visible at work, frequent snacking or coffee during the day, or a job or sport where wearing trays is awkward. Those are real preferences. The trade-off is a longer stated treatment time, a higher price than the same company's day plan, a narrower range of suitable cases, and less evidence. Some people may find that full-time wear for fewer months suits them better. Others may prefer clinic treatment, where the dentist can change the plan in person.

Brands that have stopped

SmileDirectClub began winding down on December 8, 2023. Dentsply Sirona said on October 24, 2024 that it had suspended sales and shipments of Byte aligners, including Byte's night plan, and Byte's site says operations have concluded. Neither is accepting new patients.

If you already have aligners

Keep the hours you were given. Contact the clinician responsible before you change a full-time schedule to nights, or before you change trays.

When the plan finishes, a retainer holds the teeth. The American Association of Orthodontists says you will likely need one for life. Care after the last aligner is in care after aligner treatment. What a quote should separate from the headline fee, including extra aligners and retainers, is in what clear aligners cost in the United States, and how a remote plan runs, from records to retainers, is in how at-home aligner treatment works.