Welcome to Duggan Dental Group

Gentle. Experienced. Personal.

At the Duggan Dental Group, we focus on your unique dreams and smile goals. Dr. Daniel P. Duggan and Dr. John E. Seylar will create a customized treatment plan that’s designed to help you achieve a lifetime of optimal oral health and a beautiful smile you love to share!

We provide patient-centered care: every aspect of our practice — from our commitment to on-time appointments to advanced technology and techniques to our compassionate team — is for you. We are here to serve and help you attain the beautifully healthy smile you deserve.

Duggan Dental Group uses advanced dental technology, including digital X-rays, CAD/CAM, and the iTero® Digital Impression System. We also offer laser dentistry for more comfortable visits and faster healing. In addition, we provide sedation dentistry.

Our general dental services include exams, cleanings, and fillings for all ages. We also offer restorative care, including dental implants, mini implants, and implant-supported dentures. We provide full-mouth reconstruction and the E4D Dentist™ same-day tooth restorations (crowns), inlays, onlays, and veneers.

If you’re thinking about a smile makeover, Duggan Dental Group provides advanced cosmetic dentistry, including Botox® to relax muscles and Juvéderm® XC dermal filler. Our practice is also a certified provider of Invisalign® and Invisalign Teen® clear aligners to gently move your teeth and reshape your smile!

Please contact our Bay Shore, NY dental office and schedule a visit for yourself or a loved one. We serve Brentwood, Central Islip, and surrounding communities, and look forward to serving you.

The doctors and team members at Duggan Dental Group can’t wait to meet you. We’d love to help you achieve optimal oral health and the beautiful smile of your dreams. Call and schedule a visit today!


Gentle. Experienced. Personal – The words that describe the care you’ll receive at Duggan Dental Group go on and on. This is a dental team who focuses on your unique dreams and goals for your smile, and who creates a customized dental treatment plan to help you build and maintain your beautiful smile year after year. Learn More