About Us

At Collins Dental Group in Sycamore, you will enjoy a first-class experience unlike any dental practice you’ve ever seen. From the moment you walk in, our experienced and caring staff are ready to guide you through each step of your visit. Our beautiful office is outfitted with state-of-the-art tools for quick, comfortable, and individualized results. We truly care about giving you the best experience possible.

Video Testimonials.

Our patients say

Meet the local doctors

Dr. Dennis J. Collins, DDS

Dentistry is a rapidly evolving field, and Dr. Collins sets an example for all the dentists in the practice, all of whom are committed to staying current on the latest trends in treatment.

Meet the local doctors

Dr. Mark A. Sloan, DDS

Dr. Sloan is a firm believer in patient-first dentistry, a philosophy that led him to join Collins Dental Group.

Dr. Sloan’s professional interests include advanced aesthetics, implant restoration, and root canal therapy. He is committed to continuing education and staying on top of the latest advancements in dentistry.

Meet the local doctors

Dr. Allison Sullivan, DMD

Dr. Sullivan nurtures patient relationships built on trust and respect. She keeps informed of the latest advancements in dentistry so she can provide her patients the most up-to-date treatment options.

Meet the local doctors

Dr. Tom Hensley, DDS

Like all the dentists at Collins Dental Group, Dr. Hensley stays at the forefront of dental innovation so he can provide the most up-to-date care for his patients.

Meet the local doctors

Dr. Cornell McCollum III, DDS, MD

As Collins Dental Group’s resident oral surgeon, Dr. McCollum offers patients an advantage few others in the area can match–the convenience of being seen in the comfort of their dentist’s office.

He is experienced in all phases of implant dentistry including immediate implant placement after extractions, bone grafts, sinus lifts, and All On Four implant dentistry.

Why choose Us

At Collins Dental, we want you to have every reason to smile. We offer:

  • Convenient evening and weekend appointments – open every Saturday from 8 a.m. to 1 p.m
  • Large flat screen TVs in each treatment area to highlight and visualize your specific dental care needs
  • Free Wi-Fi
  • On-site orthodontist and oral surgeon – all your dental care in one location
  • State of the art sterilization center provides sterile, individually wrapped cassettes to ensure complete patient instrument sterilization
  • Complimentary massage for every patient having a restorative procedure, so you’ll leave feeling like a star


General Dentistry

General dental procedures are specific to correcting the functioning of your teeth while helping improve cosmetic problems. General dentistry is ideal for both adult and pediatric patients.


Invisalign is a treatment that uses clear aligner trays to gently move teeth into place. The trays are worn in a series over time to create a beautiful smile. Invisalign is a...

Dental Implants

Dental implants are a permanent solution for patients seeking that perfect white smile. Implants are a great choice for patients that have broken, damaged, or missing...

Dental Emergencies

A dental emergency can occur at virtually any time, regardless of how well you take care of your smile. Unfortunately, it's not uncommon for many of these emergencies to leave a patient in severe pain and discomfort.

Cosmetic Dentistry

It's not uncommon to be unhappy with the way that your smile looks. Years of neglect, stains and discoloration can truly take a toll on your confidence.

Smile Makeovers

A full mouth reconstruction, which is more commonly called a smile makeover, is a treatment that involves completely revamping a patient's smile. Unfortunately...

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