Straighter teeth, discreet treatment
Straighten your teeth discreetly with clear aligners.
About This Treatment
Invisible aligners are a modern and discreet alternative to traditional braces. We use custom-made transparent aligners that are virtually invisible, allowing you to correct teeth positioning without compromising your aesthetics during treatment. Each set of aligners is custom-made to gradually move your teeth to the ideal position.
We Understand Your Situation
Misaligned or crowded teeth can affect much more than the appearance of your smile. Many people feel self-conscious when smiling in photos, avoid certain social or professional situations, and may even experience difficulties with chewing or oral hygiene. If you have considered correcting your smile but hesitated due to the appearance of traditional braces, invisible aligners may be the ideal solution for you.
Three Premium Aligner Systems
01
Invisalign
The pioneer and most recognized brand in clear aligners, with decades of innovation and millions of smiles transformed worldwide.
- Patented SmartTrack® technology
- ClinCheck 3D visualization
- Global provider network
- Vivera® retainers available
02
Angel Aligner
Aligner system with next-generation masterForce technology and AI-assisted planning. Over 1.5 million successful cases worldwide.
- Advanced masterForce technology
- iOrtho AI system
- Dual "7+3" system
- Excellent value for money
03
Spark Aligners
Crystal-clear aligners developed by Ormco, recognized for their superior clarity and TruGEN material that provides greater comfort and efficiency in tooth movement.
- Patented TruGEN material
- Superior crystal clarity
- Stain resistance
- Established Ormco technology
Why Choose Clear Aligners?
01
Virtually Invisible
Smile confidently throughout treatment, without anyone noticing the aligners
02
Removable
Remove to eat, drink and brush teeth normally — no food restrictions
03
Comfortable
No metal wires or brackets causing discomfort or irritation in your mouth
04
Fewer Visits
Check-up appointments every 6-8 weeks — ideal for busy schedules
05
Easy Hygiene
Brush and floss without obstacles, maintaining oral health during treatment
06
Predictable Results
Visualize the final result in 3D before starting treatment
Digital Precision Planning
Our fully digital workflow uses advanced scanning and simulation technology to create your new smile with millimetric precision.
Intraoral 3D Scanner
Digital impressions without uncomfortable molds for precise aligner fit.
3D Treatment Simulation
See your smile transformation before starting — view each stage of treatment.
CAD/CAM Manufacturing
Computer-aided design and manufacturing for perfectly custom aligners.
Premium Materials
Advanced thermoplastic materials for gentle yet effective tooth movement.
What to Expect at Your Consultation
A comprehensive assessment to determine if clear aligners are right for you and create your personalized treatment plan.
01
Oral Examination
Complete assessment of your teeth, gums, and bite to ensure you're a candidate for aligners.
02
3D Digital Scan
Comfortable intraoral scan creates a precise digital model of your teeth in minutes.
03
Smile Simulation
View a simulation of your final result and see how your smile will transform.
04
Treatment Discussion
We explain aligner options, treatment duration, costs, and answer all your questions.
Why Proper Alignment Matters
Straight teeth aren't just about aesthetics — proper alignment improves your oral health and quality of life.
Better Oral Health
Aligned teeth are easier to clean, reducing risk of cavities, gum disease, and bad breath.
Confidence Boost
A straighter smile transforms how you feel about yourself in social and professional situations.
Improved Function
Proper bite alignment reduces jaw strain, headaches, and uneven tooth wear.
Better Digestion
Properly aligned teeth improve chewing efficiency, aiding digestion and nutrient absorption.
Clearer Speech
Correct tooth positioning can improve pronunciation and eliminate speech difficulties.
Long-Term Protection
Even bite distribution prevents premature wear and protects your teeth for decades to come.
How Much Do Invisible Aligners Cost?
Answer 3 quick questions to get an indicative estimate for your treatment
What is your main concern?
Your Path to a New Smile
A simple 3-step process to align your smile with complete confidence.
01
Consultation & 3D Scan
Complete assessment of your teeth with intraoral 3D scanner. View a simulation of the final result before deciding.
~45 min
02
Custom Aligners
Receive your custom-made aligners. Detailed usage instructions: 20-22 hours/day, change every 1-2 weeks.
2-3 weeks after scan
03
Treatment & Retention
Check-up appointments every 6-8 weeks. After treatment, custom retainers keep results forever.
6-18 months
Conditions We Treat with Clear Aligners
Clear aligners effectively correct a wide range of orthodontic issues, from mild to moderate complexity. Here are the conditions we commonly treat:
Mild to Moderate
Crowding
When teeth overlap due to insufficient space in the jaw, making cleaning difficult and increasing cavity risk.
Mild to Severe
Spacing (Diastema)
Gaps between teeth that can trap food, affect speech, and impact smile aesthetics.
Mild to Moderate
Overbite (Deep Bite)
Upper front teeth excessively overlap lower teeth, potentially causing wear and gum irritation.
Mild to Moderate
Underbite
Lower teeth protrude past upper teeth, affecting chewing function and facial profile.
Mild to Moderate
Crossbite
Some upper teeth sit inside lower teeth when biting, causing uneven wear and jaw strain.
Mild to Moderate
Open Bite
Front teeth don't touch when back teeth are closed, affecting biting and speech clarity.
Mild to Moderate
Midline Shift
Center line of upper and lower teeth doesn't align, affecting facial symmetry and bite.
Mild to Severe
Tooth Rotations
Individual teeth twisted out of proper alignment, creating cleaning challenges and aesthetic concerns.
Not sure if aligners are right for you?
Book a consultation and we'll evaluate your case.
Are Clear Aligners Right for You?
This is for you if…
- Mild to moderate crowding, spacing, or bite issues
- Adults and teens with permanent teeth
- Committed to wearing aligners 20-22 hours daily
- Want a discreet orthodontic solution
- Good overall oral health
May not be ideal if...
- Severe malocclusion requiring jaw surgery
- Young children with developing teeth
- Unable to commit to wearing aligners consistently
A Word from Our Clinical Director
“We work with three leading aligner systems — Invisalign, Angel Aligner, and Spark — because each has distinct technical advantages. Rather than committing to a single brand, we evaluate your specific case and recommend the system that offers the best clinical outcome for your situation.”

Dr. Carlos Sousa
Clinical Director
First Consultation
Ready for Your New Smile?
Start your journey to a straighter smile with invisible aligners. Book a consultation and discover how discreet orthodontic treatment can straighten your teeth without anyone noticing.
What our patients say
Our patients’ feedback means a great deal to us. The team has selected the testimonials below; the rating above includes all Google reviews.
Google rating updated on October 2, 2026
“Excellent service. They take the time to explain clearly all the issues surrounding your problem and all the options for a solution. I have been having Dr. Eurico remove my amalgam fillings and replacing them safely with composite fillings. They are using the SMART protocol to protect me from exposure to mercury while doing the procedures and I am very pleased with the results as well as the attention and accessibility they have given me. The process has not been without its bumps along the way. One of my teeth was very sensitive to the new composite filling and after several weeks of attempting to solve the issue with the least possible invasive procedures, we finally had to replace it with another type of filling. I have immense trust in Dr. Eurico and the entire clinical team. Highly recommend, especially if you are looking for a dentist that will try to keep your overall health as a priority.”
Doug
Google · September 2026
“This was my first visit to this dental office, and I already can't wait to go back! I came in for a cleaning, and it was hands down the best dental experience I've ever had. The dentist was incredibly kind, spoke perfect English, and was exceptionally knowledgeable. She explained every step of the process and even highlighted how it might differ from what we're used to in the United States. What truly stood out was her attention to detail—she took the time to show me how to improve my oral care routine, something no dentist has ever done before. She was so gentle, making the entire experience comfortable from start to finish. Normally, I’m counting the minutes until I can get out of the chair, but this time, I felt completely at ease the entire visit. Highly recommend!”
Laurie Bayles
Google · January 2025
“I did my dentist cleaning with Dr. Filipa , she is an outstanding dentist with 20 years of experience. She is not only highly skilled but also very kind and passionate about her work. Every visit to her clinic is a positive experience because she truly cares about her patients’ it was one one my best dental experience comfort and well-being. She takes time to explain each procedure, making sure you feel calm and confident. Her friendly and gentle approach makes even the most anxious patients feel at ease. With Dr, you can trust that you’re in excellent hands, receiving top-quality care from someone who genuinely loves what she does. Thank you Dr Filipa.”
Anish Dhakal
Google · November 2024
“After waiting far too long to see a dentist for urgent treatment, I contacted the Ferreira Borges clinic. I was seen very quickly by Dr. Anna Carolina Ribeiro and was extremely pleased with the results. There was no pain, and she paid close attention to my well-being. I want to thank her from the bottom of my heart for restoring my beautiful smile, as well as the assistants, Angela and Samira, who were always incredibly helpful, gentle, and exceptionally kind. It's a very reassuring place. Thank you to your entire team. I almost hope I get another cavity very soon!”
Pierre Herbillon
Google · August 2025
“During my vacation in Lisbon, one of my crowns fell off while I was eating a couple of almonds. After a quick Google search, I decided to walk to the clinic since I don’t speak Portuguese and couldn’t call. I was lucky to find this dental clinic! I showed up with my tooth in a plastic bag, and they were kind enough to see me. Not only did they reattach my crown, but they also did a fantastic job. The doctor was meticulous and gentle, and I never felt like they were in a rush. Thank you!”
Lisha Sanders
Google · December 2024
“I was a bit apprehensive about going to a new dentist, since once you've had a good experience, in my case, my dentist stayed in Spain (when I moved to Lisbon) :p I was recommended this clinic with a specific doctor, and I have to say I was absolutely delighted. Everything, from the first contact to the very end, was a 10/10. They were incredibly professional. I'm so happy to have a new, trustworthy clinic here in Lisbon.”
J. S
Google · May 2022
“Highly qualified team with unparalleled attention and professionalism! 💪🏼 Thank you Dr. Ronite for the care in the evaluation and diagnosis, as well as for sharing all the treatment options! Dr. Filipa, what a badass! This amazing woman really knows what she's doing! Remarkable dedication and passion for the profession. 🤘🏼 I highly recommend them to anyone looking for high-quality dental care! 🙌🏽”
Mariana Castro
Google · June 2024
“5 stars. I was being treated at another clinic and due to the incompetence of some professionals, I had some concerns about the treatments I had to undergo. I was promptly and very well received by the receptionist. And extremely well attended to by Dr. Ana. I have already treated my cavities, had all my wisdom teeth removed, and I love all the professionalism of this clinic. I totally recommend it!”
Beatriz Tavaresdoutel
Google · July 2021
“The clinic is wonderful, especially Dr. Ana Caroline, who has been taking care of me for years. She is completely humane and dedicated, a 5-star professional! I recommend her to all my friends! Thanks also to all the receptionists who are totally attentive and polite, and to the assistants inside the office. Thank you very much to the whole team!”
Leonan Bastos Hairstylist
Google · March 2026
“I was at the clinic 3 weeks ago to treat a huge cavity and they did a five-star job on my tooth! Dr. Gabriela's work was very professional and she managed to avoid having to devitalize the tooth. Not only did it turn out perfect, but I didn't have any pain. I highly recommend the clinic!”
Carla Ribeiro
Google · June 2026
“Dr. Ana Lanhas is very thorough, friendly, and professional. The clinic is clean and accepts insurance and plans. It's located in the quiet and easily accessible residential area of Campo de Ourique.”
Nazzareno Orlando
Google · December 2020
“Who would have thought that you might actually look forward to the next dentist visit. Super nice dentists, super professional work and a very nice atmosphere generally.”
Daniel Welzel
Google · December 2019
“Dr. Filipa is a great professional who always takes the utmost care of her patients. The clinic is comfortable with friendly staff, and I was seen on time.”
Tania Whitty
Google · July 2022
“Filipa was great. She told me how to brush better and more efficient with my electric toothbrush. She explained every step. Thank you for this 5 star treatment.”
Kevin Taeger
Google · November 2025
“I recommend Dr. Tomás's cleaning service to everyone. He is a specialist, sensitive, and very attentive to patients with sensitive teeth.”
Dário Pacheco
Google · April 2026
“Competence, professionalism, perfectionism, and great friendliness!! Guaranteed recommendation! Thank you so much for everything you did for me.”
Rúben Magalhães
Google · March 2019
“Excellent service!!!! Very attentive and concerned people. Thank you, I never want another dentist.”
Mafalda Padeira
Google · November 2020
“Excellent professionals. I've already had several treatments and I recommend them for the results, conditions, professionalism, and friendliness!”
António Marques Caeiro
Google · February 2019
“Professional and caring dentist with excellent bedside manners and a "do no harm" approach. Highly recommended!”
Boaz Shmueli
Google · April 2022
“amazing dr.Carolina Ribeiro save my vacation, she is really nice and very professional 🤍”
Natalie Orlova
Google · August 2025
“Dr. Anna Carolina is always very kind and attentive. I like her very much and recommend her.”
Lucas Barboza
Google · November 2023
Frequently Asked Questions
Find answers to the most common questions about this treatment.
What are invisible aligners?
Invisible aligners are a system of removable, transparent aligners that correct teeth positioning discreetly and comfortably, without the need for metal brackets or wires.
How long does invisible aligner treatment take?
Treatment duration varies between 6 to 18 months, depending on case complexity. Simpler cases can be resolved in a few months, while more complex cases may take longer.
Can I remove the aligners to eat?
Yes, one of the great advantages of invisible aligners is that they can be removed for eating and drinking. It is recommended to wear the aligners for at least 22 hours a day for best results.
Do invisible aligners cause pain?
You may feel some discomfort in the first few days of each new aligner, but it is generally much more comfortable than traditional braces. The initial pressure is a sign that the treatment is working.
What is the price of invisible aligners?
The price varies according to case complexity and the number of aligners needed. We offer an initial consultation where we evaluate your case and present a personalized quote with payment options.
Do invisible aligners work for all cases?
Invisible aligners are effective for most dental misalignment cases, including crowded teeth, spacing issues, or irregular bites. Very complex cases may require complementary treatments.
How often should I visit the clinic during treatment?
Generally, follow-up appointments are scheduled every 6 to 8 weeks to monitor progress and deliver new aligners. The frequency may vary depending on the case.
Can I play sports with invisible aligners?
Yes, you can practice sports with the aligners. For contact sports, we recommend removing the aligners and using an appropriate mouthguard for better protection.
Are invisible aligner results permanent?
Results can be long-lasting if you use retainers as recommended. After treatment, it is essential to wear a retainer to keep teeth in the correct position.
From what age can you use invisible aligners?
Invisible aligners can be used by teenagers from age 12-14, when most permanent teeth have erupted. They are also very popular among adults of all ages.
How do you choose which aligner system to use for my case?
The choice of aligner system is made after a complete evaluation of your case. We consider the complexity of treatment, your personal preferences, budget, and specific goals. We work with the leading systems on the market, which allows us to select the most suitable solution for each patient, rather than always recommending the same brand.
Are there differences between the various aligner systems?
Yes, each system has its own characteristics in terms of materials, planning technology, and treatment protocols. However, all premium systems we use can achieve excellent results. The difference lies in finding what best suits your specific case, and that's what we do during the evaluation consultation.
How does digital technology improve aligner treatment?
We use 3D intraoral scanners to create precise digital impressions, eliminating traditional molds. Advanced software with artificial intelligence plans each treatment stage, allowing you to visualize the final result before starting. 3D printing ensures aligners perfectly fitted to your needs.
Are invisible aligners better than traditional braces?
Each system has its advantages. Aligners are more aesthetic, comfortable and allow better oral hygiene. Traditional braces may be more effective in very complex cases. During consultation, we evaluate the best option for your specific case, potentially combining both techniques.
What types of dental problems can be treated with invisible aligners?
Aligners effectively treat: crowding, spacing between teeth, crossbite, overbite, open bite and general misalignments. Mild to moderate cases have excellent results. More complex cases may require attachments (small bumps on teeth) or combined treatment.
How can I see the final result of my treatment before starting?
At the initial consultation, we perform a 3D scan of your mouth and use simulation software to show how your teeth will look after treatment. This digital simulation allows you to visualize the final smile and make adjustments to the plan before starting, ensuring you are satisfied with the expected result.
Do aligners affect speech?
There may be a slight adjustment period of 1-2 days when placing the first aligners, during which you may notice a minor speech change. Most patients adapt quickly and speak normally. Modern aligners are very thin and well-fitted, minimizing any impact.
How should I clean my transparent aligners?
Hygiene is fundamental in invisible orthodontics. You should clean your aligners whenever you remove them, brushing them gently with lukewarm water (never hot) and a soft brush. For a deeper clean and to avoid odors, you can use cleaning crystals or tablets specific for aligners. Good hygiene ensures the device remains invisible and discreet.
Can I drink coffee or smoke with the appliance?
To maintain the transparency and aesthetics of your invisible appliance, we recommend removing the aligners when smoking or consuming beverages that can stain (like coffee, tea, red wine, or curry). Additionally, hot liquids can deform the thermoplastic material of the aligners, compromising the success of the treatment.
What happens if I lose an aligner?
If you lose an aligner, contact our clinic immediately. Do not advance to the next aligner without medical guidance. Generally, we recommend going back to wearing the previous aligner until a replacement is provided, ensuring your teeth do not move undesirably during this interval.