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15 years of excellence

Hello and welcome to Union Fillmore Dental!

Dr. Marianna Rexan is a dedicated preventive, general, cosmetic and Invisalign dentist  serving San Francisco Marina, Cow Hollow and Pacific Heights Communities for more than 15 years.  We are a blend of professionalism, friendliness, technology, precision and continuing education and we will make sure that your experience  with is relaxing and comfortable.  Our goal is to help you maintain the highest level of oral health through education and prevention. We can also help you achieve the fabulous smile you always wanted and  if we helped you to take on life because you can smile more confidently, we think we nailed it!

We hope to see you soon!!



Patients  Come First

Smiling for the Camera

Checkups and Gentle Cleanings

New Patients Welcome!

We will do a thorough exam, including cavities check, oral cancer and TMJ screening , gums evaluation as well as a gentle professional cleaning.  We know you are busy, we will take only an hour to hour and a half of your time.  Call us (415) 346-9173 to schedule an appointment and start  on your path to a healthy sparkling smile!

The mouth is often considered a window to the rest of the body because many other illnesses first present themselves as changes within the mouth. As a result, a comprehensive oral exam is recommended each time you visit a new practice to serve as a benchmark of your overall health. 

Although you may have a great dental care routine, it's important to schedule regular teeth cleanings. These services help maintain your oral health and prevent cavities as well as other dental issues from developing. At Union Fillmore Dental Office in Marina, Cow Hollow, San Francisco our dentist has the necessary tools to keep your smile healthy and strong.

Smile Design

Throughout your life, you may have experienced accidents, dental problems, and other difficulties that made your smile less than perfect. A smile design at Union Fillmore Dental Office is a personalized treatment plan of cosmetic and restorative dental procedures that will help improve the appearance of your teeth — and the overall health of your mouth. A smile design could include teeth whitening (at-home or in-office treatments), cosmetic veneers, straightening, bonding and contouring, and replacing old metal fillings with composite resin or porcelain. Your smile makeover could also include dental restorations like crowns or bridges to replace a missing tooth or teeth.

Every smile design is customized, so our dentist will go over what to expect during your treatment plan, including how many appointments you may need. Throughout your smile design journey, our team will be accessible to answer any questions you may have.

 If you are interested in improving your smile so it's beautiful and healthy, schedule a consultation at our office in San Francisco to get your personalized plan.

Blonde Smile


Invisalign offers an alternative to traditional metal braces by using clear aligner trays to help gradually straighten your teeth. Most of the time, people assume this is a cosmetic therapy, and they’re not wrong – Invisalign can help move teeth into a beautiful, perfect, arch. At Union Fillmore Dental, we believe the benefits of Invisalign are more than just cosmetic.

Dr. Marianna Rexan offers expert Invisalign services in San Francisco Marina, Cow Hollow.
Invisalign® is a state-of-the-art alternative to braces that is virtually undetectable to other people. Invisalign straightens your teeth, not with brackets or wires, but with a series of clear, customized, removable appliances called aligners. Many SF patients find these type of “braces” more convenient as they are removable and not permanent fixtures.

 Dental Bonding

If your tooth is chipped, cracked, discolored, or decayed, then dental bonding might be the answer. At Union Fillmore Dental Office in San Francisco's Marina Cow Hollow neighborhood, Marianna Rexan, DDS, offers bonding procedures to restore the health and appearance of damaged teeth. Bonding is one of the simplest, most cost-effective cosmetic procedures available to you. It’s straightforward, painless, and convenient, taking just one short in-office visit. 

In this procedure, a tooth-colored resin material is applied to your tooth and shaped until it looks like your naturally occurring tooth. It is then hardened in place with a special dental light, effectively bonding it to the tooth. This requires the skill of an expert dentist who understands how to make the restored tooth blend in with the surrounding ones. At our office, we are experts at doing so and will ensure that, regardless of the type of restoration you receive, your smile will look amazing.

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Smiling Woman

Teeth Whitening

Taking Care of You

If you live in San Francisco or the local area, you can benefit from a teeth whitening procedure at our local dental office. At Union Fillmore Dental, we are known for improving the appearance of our patients’ smiles. We are a cosmetic dentist and has multiple ways for doing so. We often recommend a teeth bleaching procedure because it is by far the easiest way to transform your smile. After cleaning your teeth, we can complete this procedure in time for a special event or as part of your regular oral health routine.
If you’ve tried over the counter teeth whitening options with little to no success, Dr. Marianna Rexan offers customized professional whitening solutions that deliver smiles up to ten shades brighter. If you’d like to find out more about teeth whitening solutions, contact our team to schedule your cosmetic dentistry consultation.(415) 346-9173. We welcome patients from San Francisco Bay Area and other communities to visit our office!

Crowns and Fillings

With tooth-colored fillings and porcelain dental crowns from Union Fillmore Dental Office, your health and beauty comes together for great smiles. Over the years, people have come to demand natural-looking dental restorations. In the past, dental fillings were made of silver amalgam and crowns were made of metal. These materials offered strength, sure, but they also left smiles with dark spots or metal-coated teeth. sure, but they also left smiles with dark spots or metal-coated teeth. Today, though, we offer tooth-colored fillings and porcelain crowns, allowing your smile to maintain its natural appearance while fixing cavities, cracks, chips, and severely damaged teeth.

Dental problems are always best tackled as early as possible. We perform a number of restorative dentistry procedures as well, so your health is safe in the hands of Dr. Marianna Rexan and her staff at Union Fillmore Dental studio. We serve patients from San Francisco Marina Cow Hollow, and other nearby communities as well.

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Porcelain veneers are sometimes referred to as “instant orthodontics” because they can be used to cover a variety of dental problems. Porcelain veneers can improve the appearance of your teeth but cannot realign the jaw or correct overbites and under bites.

Orthodontics are required to correct these more complicated problems. Items that porcelain veneers can correct include:

  • Spaces between the teeth.

  • Poorly shaped or crooked teeth.

  • Broken or chipped teeth.

  • Permanently externally stained and/or internally stained teeth.

  • Unsightly or stained fillings.

To find out more about Cosmetic Dentistry and the variety of sophisticated services our Union Fillmore Dental office offers or to schedule an appointment simply call our San Francisco dental practice at (415) 346-9173.


Locating hidden decay before it destroys tooth structure (from the inside out) is a major goal for modern dentistry. The widespread use of fluoride supplements in dental materials, toothpastes, and drinking water has made tooth surfaces harder and more resistant to decay. However, diagnosing cavities beneath the hard surfaces is more challenging because the disease process can start through microscopic defects in the hard surface enamel and can readily spread into the softer tooth structure beneath the surface.

The DIAGNOdent allows the dentist and hygienist to locate hidden decay and, with treatment, stop the spread of this infectious disease before it destroys the tooth from within.
This unique instrument provides instant feedback on the health of the tooth.
A pen-like probe simply glides over tooth surfaces, constantly checking the health of the tooth. A visible number scale and an audible alarm signals the operator when there are signs of hidden decay. This new technology is completely safe and pain-free.

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Digital X-Rays

X-rays help the dentist evaluate and definitively diagnose many oral diseases and conditions. We believe that digital X-rays provide us with state-of-the-art technology, thereby allowing us to provide our patients with the best dental treatment available.

Immediacy of viewing the image is a significant clinical advantage in accomplishing many oral procedures. Digital X-rays can be viewed within seconds on a computer monitor, which makes digital radiography highly desirable.
The reduction in radiation offered by digital radiography - usually 70 to 80 percent, and at times even more - allows multiple images for the same radiation exposure involved in a single image obtained via conventional radiography. This reduction in radiation is especially important in procedures in which multiple images frequently are needed.

Dexis CariVu

At our dental office, your comfort and oral health are priority number one for us. That’s why we offer the Dexis CariVu Transilluminator as an alternative to traditional x-rays for patients who are not comfortable having them taken for whatever reason. It’s also just another way that we can ensure that your overall oral health is always as good as possible.

What Are Some of the Benefits?

  • Early Detection – CariVu has been proven to reveal cavities earlier than a traditional x-ray and is 99% accurate in finding decay band cracks.

  • Zero Radiation – Unlike traditional x-rays CariVu has no radiation. That is particularly beneficial for children, pregnant women, and others who are not comfortable with radiation that comes from traditional x-rays. Since there is zero radiation emitted, it can be used as often as needed.

  • At Union Fillmore Dental Office, we are proud to offer the Dexis CariVu Transilluminator. Contact us today to learn more.

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Laser Treatments

At Union Fillmore Dental Office, we perform laser treatments as in-office procedures and they typically only require a local anesthetic. However, other sedation options are available if you have any anxiety or dental fears. Before your procedure, your dentist will go over exactly what to expect during the treatment. Laser treatments minimize bleeding and can eliminate the need for stitches in laser gum treatments which can lead to quicker healing times. 

Whether you have to take care of gum disease, eradicate tooth decay, or improve the appearance of your smile, laser treatments offer faster appointments and recovery times. To learn more about laser treatments or to schedule a consultation, contact our office at (415) 346-9173

Dental Inlays and Onlays

Classified as somewhere between a tooth-colored filling and a crown, an inlay or onlay can restore a decayed or damaged tooth. Used on pre-molars and molars, a dental inlay covers the concave center of a tooth while an onlay covers the tooth's rounded, upper edges. Like fillings and crowns, inlays and onlays can be made with different materials — composite resin or porcelain. Our experienced dentist can help San Francisco patients better understand crowns, fillings, inlays, and onlays so they can make the best choice about how to treat their tooth at Union Fillmore Dental Office. 

An inlay or onlay is a good choice if you have a cracked tooth or a large cavity that is too big to get filled but doesn't need the complete coverage of a crown. During your exam, your dental specialist may use your digital x-rays to pick the best method for your tooth. If an inlay or onlay is selected, they will discuss the available materials that will best fit your requirements. You can also discuss whether you would prefer a direct restoration (an inlay or onlay made at our office with advanced technology while you wait) or an indirect restoration made at a dental laboratory.

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Beautiful Women

TMJ Treatment

TMJ often causes severe pain and discomfort and can be temporary or last many years. But it can be treated. 

Do you wake with a clenched, aching jaw or a headache? If symptoms of temporomandibular joint (TMJ) disorder are causing significant discomfort and inhibiting your daily lifestyle, we can help. Union Fillmore Dental Office uses innovative technology to provide diagnosis and treatment for a range of oral health concerns, including TMJ disorder. TMJ treatment can vary from provider to provider. But, we offer a comprehensive approach to this disorder and a protocol that uses the latest in technology for diagnosis.

Sleep Apnea Treatment

Difficulty staying asleep, attention problems, waking up with a dry mouth or sore throat, and morning headaches are all symptoms of sleep apnea.

Sleep apnea causes low blood oxygen levels and chronic fatigue that, over time, causes a slow deterioration of the immune system. Left untreated, sleep apnea can significantly increase your risk for serious systemic health problems like heart attack and stroke.

In our mission for dentistry for complete health, we can help diagnose and treat sleep apnea with a simple at-home test and an affordable, non-invasive solution. We want to help you sleep better tonight to ensure a happier, healthier tomorrow.

If you believe you or a loved one may have sleep apnea, call our office today to

 schedule a free consultation (415) 346-9173.

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Invisalign Overview

The Invisalign® system corrects bite issues and malocclusion with a series of aligners made of a clear, thin, medical-grade polymer. Because the aligners are clear, they are virtually invisible when worn, enabling adults and teens to wear aligners throughout the day without the aesthetic discomforts that can accompany bulkier and more noticeable orthodontics. 

Each set of aligners will move your teeth closer to their ideal position over the course of treatment, with new sets being provided every eight to ten weeks. By gradually moving the teeth without brackets or wires, Invisalign® tends to be a more comfortable and less painful way to move teeth than traditional braces. The treatment is also much faster, averaging 12 to 18 months for adults as opposed to 36 or more for wire and bracket alternatives.


How do I know if Invisalign is right for me?

To find out if Invisalign® is a good fit for you, schedule a free 30-minute consultation. We will complete a quick 3D scan of your teeth and show you a preview of how Invisalign® would transform your smile.

How does Invisalign straighten teeth?

Invisalign® uses clear, custom-made aligners that gradually shift your teeth into place over time. Each tray in the series will make your teeth slightly straighter than the previous tray.

Will a dentist see me in office?

It is important to check in with your dentist regularly throughout treatment to make sure everything is still on track. All periodic visits are covered in the cost of your treatment.


Contact Us

3003 Fillmore St, San Francisco, CA 94123


Female white toothy smile

“For someone who dreads the annual dental appointment, I had the best dental experience at Union Fillmore Dental office, Dr. Rexan and her staff are very friendly, polite, and professional. Dr. Marianna Rexan talked me through everything he was doing and was also very patient and understanding. She was also very gentle which is very important for those of us sitting in the dental chair with a million anxiety thoughts running through our minds. It was the best cleaning I had. I was very happy with the results. I recommend Dr. Rexam at Union Fillmore Dental to everyone! You will not be disappointed.”

Sandy Williams

“I had a very good experience at Union Fillmore Dental Office! I always dreaded going to the dentist but surprisingly this is the first dentist that I’ve been to where everything was quick and painless!! Thank you!!”

Casey Johnson

“I first met Dr. Marianna Rexan years ago when my friend referred me to her. I needed a dental implant at the time, needless to say I was terrified. I’ve had a lot of bad dentistry over the years but Dr. Marianna gives the MOST painless injection ever. It’s been a couple of years my implant is still as solid as a rock.
I still see Dr. Rexan every 6 months, she personally does my cleanings. She’s very calming, gentle, doesn’t rush, and explains procedures as she goes. I can tell she loves what she does. I actually now enjoy going to the dentist.”

Robbie White