Invisalign side effects

Page updated October 22, 2026.

Invisalign and other clear aligners are generally comfortable, but they do have side effects. Most are mild and short-lived, like soreness for a few days after each new set of aligners. Others depend on your habits, like cavities and stains if you drink anything but water with the aligners in. Serious reactions are rare. Here is what to expect, how aligners compare with braces, and when to call your orthodontist.

Common side effects at a glance

Soreness and pressure

Aligners put gentle pressure on your teeth to move them gradually (AAO), so some pressure is expected. Cleveland Clinic says you may notice pressure or soreness when you chew or take the trays out, and that it typically eases within a few days (Cleveland Clinic). In a 2005 study cited by Healthline, 54% of aligner wearers had mild pain, 35% had none, and 44% reported discomfort when chewing (Healthline). People in another report said symptoms lasted 2 to 3 days after each new aligner (Healthline), so mild discomfort can come back briefly every time you switch trays.

Pain can be focused on one tooth as it moves, and rough aligner edges can rub the gums (Healthline). Soft foods, an ice pack on the jaw and over-the-counter pain relievers help (Cleveland Clinic). Don't take the aligners out to escape the discomfort: they need to be worn at least 22 hours a day (AAO). More in do braces hurt.

Effects on teeth and gums

• Cavities and white spots. Aligners can trap liquids and food against the teeth (AAO), and wearing aligners while drinking anything other than water is one cause of white spots (AAO).
• Attachments. The small tooth-colored bumps some people need stay on throughout treatment and are removed at the end (Invisalign.com). See Invisalign attachments
• Gums. Reviews comparing treatments found periodontal (gum) health was better with aligners than with fixed braces (Yassir et al., Clin Oral Investig)
• Black triangles. Small gaps near the gumline can appear after treatment with braces or aligners (Sahu et al., F1000Research). See black triangles after braces
• Root shortening. The risk of root resorption tended to be lower with aligners than with braces (Yassir et al., Clin Oral Investig)

How side effects compare with braces

An overview of 18 systematic reviews compared clear aligners with fixed braces (Yassir et al., Clin Oral Investig):

The authors rated the evidence moderate and supported aligners as an alternative to braces for mild to moderate problems, but not severe ones (Yassir et al., Clin Oral Investig). See is Invisalign worth it.

Rare reactions

Allergic or hypersensitivity reactions to orthodontic appliances are rare. A 2024 review says they're usually caused by ions released from metal and non-metal materials and can show up as redness, ulcers or swollen gums (Di Spirito et al., J Funct Biomater). Clear aligners made from polymers can cause them too, but fixed appliances carry a higher risk, and nickel is a significant allergen (Di Spirito et al., J Funct Biomater). If you have known allergies to plastics or dental materials, tell your orthodontist before treatment.

When to call your orthodontist or dentist

• Bleeding gums, or sensitivity to hot or cold (Healthline)
• Pain when eating, drinking or swallowing, or pain with facial swelling (Healthline)
• Swelling, ulcers or a rash in the mouth that could be a reaction (Di Spirito et al., J Funct Biomater)
• An aligner that no longer fits, or a lost or damaged aligner (AAO)
• An attachment that falls off (Invisalign.com)

How to reduce side effects

• Take aligners out to eat and to drink anything other than water (AAO)
• Brush before putting them back in (AAO)
• Keep them in their case when they're out (AAO)
• Wear them at least 22 hours a day (AAO), and switch trays on schedule
• Wear your retainer after treatment, because teeth are especially prone to moving back at first (AAO)