Dr. Keith Marshall

A Little Bit About How I Got Here

I’ve been a general dentist since graduating NYU Dental College in 1979. I started my practice in that same year with an office in Gramercy Park and attended the Greater NY Dental Meeting for the first time. There was a huge buzz at the show about light-cured composites (white fillings) where the light acts as a catalyst to harden the fillings.

Fast forward 28 years to 2007 when I was trained in the LANAP protocol for the treatment of periodontal disease, I was also taught how to use lasers to treat tissues that were injured. Shining the laser light on an injury accelerates and improves the quality of the healing. This is called photobiomodulation therapy (PBMT). Back then we called it “cold laser therapy”, biostimulation, or low-level light therapy (lllt). It is the most effective therapy for injuries such as whiplash, sprained joints, frozen shoulder, bruises, jammed fingers, and flesh wounds.

Earlier this year (2018) I went to a lecture given by James Carrol, Thor Laser CEO and designer of the NovoTHOR whole-body light pod. Impressed by the science presented, Sandi, my wife, and I signed up for weekly sessions. My first experience was pleasant but unremarkable with regard to any noticeable improvement. My tennis elbow was no longer hurting after my second session. Typical soreness in joints started to disappear after the third or fourth session. As the sessions continued we became stronger (as measured by the performance at the gym), more mentally focused (Jeopardy isn’t as hard), and our complexions are visibly healthier. I felt, and still feel like I am ten years younger. And Sandi is getting prettier every time I look at her.

For all the cool lasers and other dental technologies I have invested in over the years in my practice, the NovoTHOR will make the biggest impact in overall health. It was time to bring this therapy closer to home (work actually). After all, what dentist wouldn’t want to be able to say “I have the healthiest dental patients in NYC”. Of course, you don’t have to be a dental patient to reap the benefits; It’s open to all.

Photo of Dr. Keith Marshall DDS


1133 Broadway Suite 812
New York, NY 10010


(929) 390-1940