Joy Raskie, RDH

Director, Advanced Dental Hygiene

As the director of Advanced Dental Hygiene, Joy believes in a more hands-on and integrative approach with her continuing education courses. She lectures, conducts laser training courses and does in-office laser consulting. For the past 15 years, she has been practicing as a clinical hygienist in and around Denver, Colorado.  For over 12 years, Joy was head of the Dental Hygiene/Periodontal program, where she successfully implemented lasers into the hygiene program. Her passion for lasers has led her to obtain Fellowship Certification and 2 Associate Fellowship Certifications for the Diode laser through the World Clinical Laser Institute (WCLI). She is a member of the Academy of Laser Dentistry (ALD) where she obtained one of the highest degrees in laser dentistry, an Advanced Proficiency in dental lasers. She is among an elite group of 20 RDH’s who holds this certification worldwide. Joy is a member of the American Dental Hygienists’ Association and Colorado Dental Hygienists’ Association. Joy is deeply passionate about teaching and integrating her audience to make learning more fun. Her goal is to help everyone feel confident and ready to succeed after leaving her courses.

Joy is married with a beautiful daughter and two Akita pups. She enjoys spending time with family, traveling, reading, cycling, swimming and practicing yoga in her spare time.

TDA Headshot Photo

Dr. John Drisdale DMD


Dr. John Drisdale is a general dentist who works in private practice 20 miles South of Austin in San Marcos, Texas. He graduated from the University of Pittsburgh School of Dental Medicine. Dr. Drisdale has an advanced laser certification and actively uses the diode and Erbium YAG laser daily. He is a published author for his TMJ research in the “International Journal of Dentistry”. Dr. Drisdale holds a permit for and practices sedation dentistry. He is very active in continuing education and averages over 120 CE hours per year. Dr. Drisdale is actively training with The Peter Dawson Academy and is giving a lecture to a group of dentists on Removable Partial Dentures later this year. He is a member of the Seattle Study Club and TAGD Master Track. Dr. Drisdale is a member of ADA (American Dental Association), AGD (Academy of General Dentistry), and the Delta Sigma Delta Alumni (national dental fraternity).

Dr. Drisdale is married to his beautiful wife Monica and has a rescued Boston Terrier named Waffles. He loves traveling to the beach, grilling and smoking BBQ, and going out on his boat on Lake Travis (Austin, Texas).


Janessa Bock, RDH, AAS, AS


Janessa is a Registered Dental Hygienist and works full time in private practice in Katy, Texas. She graduated from Amarillo College with an Associate of Science degree in Dental Hygiene, as well as Cottey College with an Associate of Science degree in Biology. Janessa has been trained in multiple lasers and has been using them in private practice since 2007. Janessa has a passion for her profession, which is displayed by her enthusiasm to learn and grow as a hygienist in the field.

Janessa has been a member of the ADHA since 2007. She has served in various leadership positions with her local and state component since moving to the Houston area in 2009 from Colorado. Janessa is a past president of the Greater Houston Dental Hygienists Association, which grew to over 300 members when she was president. Janessa has served as TDHA Legislative Director for the past two years. Janessa is currently serving as TDHA President- Elect.

Janessa enjoys spending time with her husband and two young daughters.


Heather Gill, RDH


Heather has been in dentistry over 20 years and using lasers daily for the past 10 years. She currently is a full-time dental hygienist in Lakewood, Colorado. Heather joined the Academy of Laser Dentistry (ALD) in 2009 where she obtained her Standard Proficiency in Dental Lasers. In 2015 she achieved one of the highest degrees in laser dentistry, an Advanced Proficiency in the Diode Laser. Heather currently sits on the Board of Directors as the Auxiliary Chair for the ALD and has been on the hygiene discussion panel for the past 5 years.  Since the introduction of the laser into daily patient care, she has noticed less need to repeat periodontal therapy. Not only does Heather specialize in treating periodontal disease with the laser but she also has taught courses and specializes in implant care utilizing the diode laser to treat Peri-implant mucositis. Heather has extensive training with Fortune Management and Hygiene Mastery. She is a member of the American Dental Hygienist Association (ADHA) and an auxiliary member of the International Congress of Oral Implantologists (ICOI). Heather’s passion lies in taking the very best care of her patients through constant and never-ending improvement. She tries to accomplish this by bringing the most up-to-date technology and knowledge to her patients every day.

Heather enjoys spending time with her son, skiing, running, traveling, and some martial arts. She is also currently relearning how to play her flute.


Cassandra Coopmans, RDH


Cassandra is a full time clinical hygienist in Aurora, Colorado with a focus on high-anxiety patients and sedation dentistry. She started her career in corporate dentistry and then five years ago moved on to private practice, where she received extensive training in patient communication and treatment planning skills, at which point she took her first step into laser dentistry with a training class on the diode and WaterLase. Encouraged by the positive results witnessed in clinical practice both on the hygiene and doctor’s side, Cassandra became an advocate for laser use. Most recently, she instructed a dentist friend of hers on the benefits of gingival troughing instead of cord packing for crown preps and while visiting Montana she showed a laser dentist how to use his Biolase to treat cold sores and aphthous ulcers! Cassandra has a love for learning and teaching others. Her senior year of hygiene school she was selected to be the tutor for the entire Hygiene Program, graduating with a Presidential Leadership Award and Colgate Professionalism Award. Cassandra has helped her entire office with implementing lasers on all levels and instructs all new hygienists on how to get optimum results using the laser in perio. She instructs laser courses nationwide and specializes in working with the entire team/office incorporating lasers.

In her free time Cassandra enjoys watercolor painting, cooking, visiting her family in Montana, and dreaming about Colorado implementing a dental therapist level provider so she can implement the use of hard tissue lasers as well!


Linda A. Hirce, RDH


Linda has over 40 years of oral care experience as a registered dental hygienist, an educator, dental resource for marketing firms, consumer web sites and study club coordinator. Linda is an instructor for Advanced Dental Hygiene with a specialty in fighting periodontal disease with laser as well as communication skills with patients. She holds multiple laser certifications and has been mastering and using lasers for the past 10 years. For many years she worked in an implant-periodontal office and more recently for a general dentist who incorporated lasers into her practice. Linda was part of a task force within the Colorado Dental Board that was charged with amending and defining the rules & regulations for laser use by Colorado state dental professionals. Currently Linda is a member of the American Dental Hygienists’ Association (ADHA), Colorado Dental Hygienists’ Association (CODHA-Boulder component). She has received many awards over the past 40 years for her various outstanding community outreach programs; sat on the CODHA board throughout the years as President, Vice President and Treasurer; was a Colorado State Delegate to ADHA; featured in “Access” magazine, was a speaker for the Seattle Study Club, attended the Pankey Institute  and helped develop the Jersey Coast Dental Forum.

Linda enjoys hiking with friends on the local mountain trails and leading senior volunteers in a charity knitting group.

Andrea 2019

Andrea Tresner, RDH, BSDH, CDA


Andrea has been in the dental field for 18 years and using lasers for the past 5 years. She has worked in all facets of dentistry from Public Health to Corporate to Private practice and now currently teaches dental hygiene full time in Kansas City, MO. While in private practice, Andrea incorporated lasers into her periodontal program and was very impressed with the positive results she saw firsthand. Andrea holds multiple laser certifications for the diode laser and has spent over 200 hours studying and researching dental lasers.  Andrea started her dental career as a dental assistant and then taught in a dental assisting school. Since becoming a laser hygienist, she has studied and mentored under a couple different laser dentists being able to see the differences of scalpel use and laser use. Andrea is an instructor for Advanced Dental Hygiene. She has a true passion for teaching and makes sure everyone leaving her courses feels comfortable and confident to incorporate lasers into their everyday practice.

In her spare time Andrea likes to travel, and hike. She especially likes to hike in the Southwest. Her bucket list includes hiking in every state in the US with her husband. She also enjoys traveling abroad and participating in Dental Mission Trips.


Amanda Ledford, RDH

Hands-On Instructor

Amanda is a full time clinical hygienist in Sherman, Texas. She holds an Associates of Applied Science Dental Hygiene degree as well as a Standard Proficiency in the Diode Laser. Amanda has been in the dentistry field for 8 years and prides herself on staying up to date on the ever-changing standard of care for her patients.

In her free time, she enjoys spending time with her husband and their son and visiting her parents farm.


Ally Parks, RDH

Hands-On Instructor

Ally works in Dallas, Texas as a full-time clinical hygienist. Always passionate for helping others, she obtained her Dental Hygiene Degree in 2014. From her first day as a Registered Dental Hygienist, she sought new ways to improve the health and lives of her peers. Ally worked with operations such as Dentistry from the Heart and Texas Mission of Mercy, all with the intent to give back to local communities. Ally holds a Standard Proficiency in Dental lasers; she is a member of the American Dental Hygiene Association and the Texas Dental Hygienist Association.

In her free time, Ally hikes around Texas and spoils her Australian Shepherd, Jax, with frequent trips to local lakes.

Advanced Dental Hygiene is designated as an Approved PACE Program Provider by the Academy of General Dentistry. The formal continuing education programs of this program provider are accepted by AGD for Fellowship, Mastership, and membership maintenance credit. Approval does not imply acceptance by the state or provincial board of dentistry or AGD endorsement. The current term of approval extends from 1/1/2020 to 12/31/2023. Provider ID# 381332