Invisalign lip irritation (cutting lip)

When your Invisalign aligners are cutting your lips or causing irritation, it can be quite a concern for some patients, especially during the initial stages of their treatment.

While the aligner trays are designed to be smooth and comfortable, certain factors can contribute to lip irritation. These include imperfections from manufacturing and wear and tear from eating with aligners, which causes rough edges on the aligner trays.

Friction due to lack of tray lubrication can also potentially hurt your lips when removing and inserting aligner trays due to the repetitive rubbing and pressure applied to the lip tissues.

Let’s discuss the possible causes and solutions for Invisalign lip irritation:

Invisalign lip irritation

Friction from inserting and removing Aligner Trays

Your lips can get cut or irritated under certain situations when removing or inserting the aligners. Here are a few causes and solutions:

Problem 1: Dryness and sensitivity

The repeated sliding of the aligner trays against your lips, especially if the trays are snugly fitted, can cause the lips to become dry and sensitive over time. Dry lips are more prone to irritation and may develop cracks or small cuts when subjected to friction.

Problem 2: Rough or jagged tray edges

If the edges of the aligner trays are rough or have not been adequately smoothed, they can create friction against the delicate lip tissues. This friction can lead to discomfort, redness, and even small abrasions or cuts on the lips.

Problem 3: Improper removal technique

Removing aligner trays requires precision and a gentle touch. If you use excessive force or pull on the trays in a harsh manner, it can cause the trays to scrape against your lips, resulting in lip irritation or injury.

Problem 4: Lack of lubrication

If your lips are already dry or chapped, the friction from removing or inserting the trays can exacerbate the existing condition and cause discomfort. Additionally, if you haven’t applied any lip balm or moisturizer prior to handling the trays, the lack of lubrication can make the friction more noticeable and potentially harmful to the lips.

To minimize the impact of friction on your lips during Invisalign treatment, you can take the following steps:

Solution 1: Keep your lips well moisturized

Apply lip balm or a moisturizing lip product before removing or inserting the aligner trays. This helps reduce the dryness and enhances lubrication, minimizing the potential discomfort caused by friction.

Solution 2: Be gentle when removing and inserting trays

Use a gentle and controlled technique when removing and inserting the trays. Avoid applying excessive force or pulling on the trays, as this can increase friction against the lips. Instead, use your fingertips or the recommended tools provided by your Invisalign provider to carefully guide the trays in and out.

Solution 3: Address rough or jagged tray edges

If you notice rough or jagged edges on your aligner trays, consult your Invisalign provider. They can smooth down these areas to minimize friction and prevent potential lip irritation.

Additional Causes and Solutions

1. Tray alignment and fit

Improperly seated trays or trays that extend beyond the natural contour of your teeth can cause the edges to rub against your lips.


Ensure that your trays are properly seated and well-fitted. Using an Invisalign chewie, a small cylindrical device provided by Invisalign, can help seat the trays properly and reduce the chance of them poking out and irritating your lips.

2. Speaking patterns and lip movement

Some individuals naturally curl their lips or have speech patterns that involve frequent lip movement. This can increase the likelihood of the trays catching on the edges of your lips.


Being mindful of your lip movement and speaking patterns may help reduce the chances of lip irritation or the trays cutting your lips.

3. Filing and smoothing sharp edges

In some cases, aligner trays may have slight imperfections or inconsistencies during the manufacturing process. These imperfections can lead to uneven edges or rough spots that feel sharp against the oral tissues, including the lips. Moreover, wear or damage from eating with your aligners or accidental damage can also cause the edges of the trays to become rough or jagged, leading to potential discomfort or irritation to the lips.


If you experience persistent lip irritation, you can try filing down any sharp or rough edges of the aligner trays. Use a two-sided emery board or a fine nail file to carefully smooth out any areas that may be causing discomfort. Take caution not to remove too much material or alter the shape of the trays.

4. Using dental wax or lip balm to reduce friction

Friction can potentially hurt your lips when removing and inserting aligner trays due to the repetitive rubbing and pressure applied to the lip tissues.


Applying dental wax to the edges of the trays that come in contact with your lips can provide a protective barrier and reduce friction. Dental wax is a soft and pliable material that can be molded to the desired shape and placed on the troublesome areas. Additionally, applying lip balm or lip gloss can help lubricate your lips, making them less likely to catch on the trays.

Final Thoughts

By taking these precautions and maintaining good oral hygiene habits, you can help reduce the likelihood of lip discomfort and ensure a more comfortable Invisalign treatment experience.

If you experience persistent or severe lip irritation, it is advisable to consult with your dentist or Invisalign provider for further evaluation and guidance. They can assess your treatment progress, make necessary adjustments to the trays, and provide guidance on how to alleviate the discomfort. They may also suggest alternative solutions or recommend specific products to alleviate lip irritation.


  • Editorial team

    A team comprising oral health care professionals, researchers, and professional Writers, striving to impart you with the knowledge to improve your oral health, and that of your loved ones. 

  • Lilly

    Lilly, aka, Liza Lee, is a passionate community oral health officer and our lead writer. She's not only well-versed in performing a multitude of dental procedures, including preventive, restorative, and cosmetic, but also an avid writer. Driven by the significant oral health burden all around her, Lilly strives to build capacity and promote oral health. She envisions making a lasting impact by advancing research, prevention, and promotion efforts to alleviate oral health disparities. Please share your views and opinions on my posts.

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