Welcome to Dentists on Washington
Philly’s Green Dentistry!

The duo of  Dr. Duyen Ngo, DMD and Dr. William J. Costello III, DMD take a green dentistry approach to reduce environmental impact while maintaining wellness.

“Not only are we committed to your dental health, but to the health of our planet as well.”

This has been our core value since inception. We’d love to see you!
Schedule an appointment today, we are even open on Saturday!.

Eco-Friendly Dental Care

Our office is committed to your oral health and the health of our planet. We are Philladelphia’s premier dentists and proud to be the City’s first eco-friendly dental practice. We are conveniently located near Center City, Bella Vista, Queen Village, Passyunk Square and Pennsport.

Our Commitment To You

All of our treatments are performed with the utmost attention to detail and patient comfort. We offer a wide array of treatments, such as cosmetic dentistry, BPA free composite fillings, Invisalign, root canals, dental implants, veneers, porcelain crowns, tooth extractions, zoom whitening, bone grafts.

Our technology and equipment to maximize your oral health

Dentsts on Washington is proud to utilize the VELscope® Vx Enhanced Oral Assessment System, a handheld scope that is used to visualize oral tissue abnormalities, including cancer and pre-cancer.

  • Our Dental Exams
  • $149
  • Evaluation of your overall health and oral hygiene
  • Evaluation of your risk of tooth decay and gum disease
  • Evaluation of your need for tooth restoration or tooth replacement
  • TMJ ( jaw joint) evaluation
  • Assessment of how much fluoride you’re getting through your diet and use of oral hygiene products
  • Dental X-rays or other diagnostic procedures if necessary
  • Evaluation of soft tissues to check for pathology

What makes our practice eco-friendly:

  • Wind Powered Electricity

    All of the electricity used to power our office and building is powered by 100% wind energy.

  • Amalgam Separator

    Though not yet required by Pennsylvania law, we have installed a device which removes mercury from our waste water and prevents contaminants from reaching our sewer system and local waterways.

  • Digital X-rays

    We utilize digital x-rays in our office, which not only offer improved imaging and diagnostics over traditional x-rays, but allow for a significantly reduced amount of radiation exposure needed to capture an x-ray image. In addition to this benefit, caustic chemicals are not needed to develop digital x-rays and no hazardous waste bi-products are associated with them.

  • Digital Charts

    All of records are stored digitally which eliminates paper waste.

  • Waterless Vacuum

    Our dental vacuum or suction system is waterless, which saves about 360 gallons of water per day compared to a traditional dental vacuum system.

  • Steam Sterilization

    Our instruments are sterilized using the chemical free method of steam sterilization. This system is not only safer for the environment but also offers superior sterilization compared to traditional methods of sterilization.

  • E-Claims

    All of our insurance claims are sent electronically to insurance carriers to avoid the unnecessary waste of paper.E-Claims

  • BPA Free Composites

    We offer composite (tooth colored) fillings which do not contain the chemical bisphenol A.

Ryan Autumn
Ryan Autumn
Highly Recommended, The treatments are reasonably priced and the office is well-maintained. Overall, Dentist On Washington is great!
Wei Yee Lu
Wei Yee Lu
We LOVE Dentists on Washington! I have been coming here for almost 8 years now. My husband and 1 year old daughter now go here too (and she loved her experience too - no crying!!). Both Dr. Ngo & Dr. Costello are so sincere, professional, honest, and kind. Their support & reception staff is amazing too. I have no idea what the last reviewer was talking about; that has NEVER been my family's experience here. Both Drs work seamlessly together, sometimes Dr. Ngo will start, and Dr. Costello will finish up - but they are always so communicative to what's going on, etc. They always make time to answer any questions, both in person & through email. Seriously, anyone who is looking for a new dentist, go here! I can't recommend them enough.
Attique Ur Rehman
Attique Ur Rehman
I highly recommend Dentist On Washington to anyone who is looking for dental care in philly.
Jonathan Stish
Jonathan Stish
One of the most efficient Dental practices in all of Washington! Excellent service and great energy!
Ashraf M
Ashraf M
This would have been my ideal and regular dentist but both time I went, I've had negative experience. Dr. Costello is very condescending and immature if he is asked questions. He left me in the chair abruptly because I was asking too many questions and didn't even tell me he was done. I waited there for 10 min+ and he was just ignoring the situation. Such childish behavior. There are other folks i know in the area says they make you do procedures when it's not absolutely necessary. I've decided to take my business elsewhere. If you can't respect your patients and treat them with value, then you should not be in this field. Dentist here has too much ego. I'll comeback here when he no longer works here.. but I guess they own the practice?
Emily McKeon
Emily McKeon
Being my first time at Dentists on Washington and my first time back to any dentist since before the pandemic, I didn't know what to expect. I paid out of pocket, but they provided great specials. I was able to have two of my fillings replaced and they feel ten times better than my original ones! All in all, I am very happy with my experience!
I don’t even know where to begin. Everyone here was so lovely. From the front office staff to the Hygienist to Dr. Costello and Dr. Ngo. I’ve never had a tooth extracted before and was so absolutely scared to death about getting 2 wisdom teeth pulled but everyone here made it feel a lot less scary. Everyone made sure I was comfortable and explained to me that my comfort was the most important part of everything. I’m still recovering now but wanted to make sure I stopped by here to thank everyone again. I could go on and on about how great u all are but I’m gonna get back to resting. Thank u all again! :)
Raymond O'Hara
Raymond O'Hara
A great all around experience. Both Drs. Costello and Ngo were both very welcoming and professional, making the experience that much better. Would recommend anyone living in the Philadelphia area in need of great dental office, to set up an appointment ASAP.
Justin Geller
Justin Geller
These are best dentists I have ever been to. Super friendly staff as well and the most painless cavities I’ve ever had filled. They make you feel like you’re part of the family there. If I could give six stars, I would.
Silvia Rubio
Silvia Rubio