Why do I need rubber bands with Invisalign, and how do the hooks and buttons work?

Where a band hooks on, and who decides

Every elastic stretches between two anchor points, upper to lower or within one jaw, and the AAO says your orthodontist chooses those points for the movement wanted. Braces use hooks instead, as the glossary entry on elastics describes; with aligners a band can hook to a cut in the aligner or to an anchor bonded to a tooth.

A cut in the aligner

A hook on an aligner is a small cut in the plastic that the band catches on; Align, the maker of Invisalign, calls it a Precision Cut in its planning software. A 2025 review in the Turkish Journal of Orthodontics says aligners whose cuts are engaged by rubber bands may need extra hold on the teeth, which it names as one of the two main jobs of attachments. Your orthodontist adds any cut to the plan.

A button bonded to a tooth

A button is a small anchor your orthodontist may bond to a tooth, and Align's planning software has a tool to position what it calls Button Cutouts. In one 2022 study in the Journal of Clinical Medicine, elastics ran from upper aligner cuts to tubes bonded on the lower first molars. Align also calls its SmartForce attachments "Invisalign buttons", though the 2025 review lists attachments and buttons as separate parts; a fallen attachment is covered separately.

Trade-offs: a daily routine and mixed bite evidence

A routine you keep yourself

The AAO says patients place, remove and wear their elastics as prescribed, and its rule is to "replace your elastics daily or as often as your orthodontist recommends" because bands lose elasticity as they age. The AAO calls each band single use and says to take elastics off for eating or brushing and put fresh ones on after; the Invisalign diet guide covers meals.

More bands than prescribed do not speed treatment; the AAO says the excess force can harm teeth and jaws or slow movement. The AAO calls some discomfort at the start normal and asks patients not to remove the elastics to relieve it. Tell your orthodontist about a latex allergy; the AAO notes that many orthodontists offer latex-free elastics.

What studies show about the bite

The research on bite correction with elastics and aligners is mixed. A 2021 study in the American Journal of Orthodontics and Dentofacial Orthopedics measured adults after their first series of aligners and observed no significant Class II correction or overjet reduction with elastics worn for an average of seven months. The 2022 study in the Journal of Clinical Medicine reported less overjet and a better molar relationship in adults, judging aligners possibly useful for limited Class II correction without significant forward tipping of the lower front teeth. Neither study settles the question; your orthodontist judges what elastics can do for your bite.

When elastics enter the plan

Whether you need elastics is your orthodontist's call, at the exam or once aligners are in place: the AAO says the orthodontist recommends aligners, braces or a combination from your needs, and that some cases are treated more predictably with braces. At Carvalho & Roth Orthodontics the first visit includes digital photos, X-rays and a talk through the options, so your first consultation is the place to ask about elastics.

If a button comes off between visits, call the office and ask what to do with the bands. The AAO says mishaps with aligners may require a call or an unforeseen visit, and we found no instruction for a loose button in its elastics guidance, so your orthodontist decides.