Meet the Team
The Children's Dental Team in Horn Lake, MS
The entire Happy Smiles Horn Lake team is passionate about ensuring your child has a great trip to the dentist. Everyone from the doctors to the administrative team works hard to make sure you and your child leave with a great big smile.
Nothing would make our entire team happier than to show you why our patients have voted us Desoto's Best Dental Clinic in the Desoto-Times Tribune and Family Favorites Best Dentist in Parents and Kids Magazine Desoto Region!
Preston McAlexander, DDM
Preston McAlexander, DDM - General Dentist
Dr. Preston McAlexander grew up in Holly Springs, MS and attended the University of Mississippi where he received his undergraduate degree in 1999. He continued his studies at the University of Mississippi Medical Center and was awarded the Doctor of Dental Medicine degree in 2004. While at the School of Dentistry, he served as student body present and representative to the American Dental Association.
Dr. McAlexander worked for five years in a community health center dental clinic as part of the National Health Service Corps. He is a member of the Mississippi Dental Association and the American Dental Association.
At the health center dental clinic, Dr. McAlexander was able to see first-hand the impact that quality dental services can have on a family. He is proud to continue his work to bring great dental care to all children, regardless of their family income.
Dr. McAlexander enjoys life outside the office with his wife and two kids. He is an active member of his local United Methodist Church.
Four Legged Family Shih Tzu named Roux, and two cats named Joe Exotic and Carol Baskin (adopted in 2020, of course).
Sport Dr. Mac loves to hit the slopes when he gets the chance.
Handyman Dr. Mac is into woodworking, and he’s currently restoring a 110 year old home.
Kristen Douglas, DDM
Kristen Douglas, DDM - Board Certified Pediatric Dentist
Dr. Kristen Douglas is a native of Mississippi’s sister state, Alabama, but has spent the last 16 years calling Mississippi her home. She received her BS from Mississippi College, and went on to graduate from the University of Mississippi Medical Center, School of Dentistry.
Before and during dental school, Dr. Kristen worked for a pediatric dentist and quickly realized how fun it was to work with children and their parents. In 2016, she completed a two-year pediatric dental residency at the University of Tennessee Health Science Center. While in residency, she had the unique opportunity to rotate through St. Jude and LeBonheur Children’s Hospitals as a part of her training.
Dr. Kristen is a Diplomate of the American Board of Pediatric Dentistry and is currently a member of the American Academy of Pediatric Dentistry, the Mississippi Dental Association, and the American Dental Association.
Outside of the clinic, Dr. Kristen makes her home with her husband and daughter. She would say that being a mother has greatly impacted how she practices. With so much information to process and decisions to make, she understands the challenges that parents face when it comes to making healthcare choices for their children. She considers it a privilege to be trusted with the care of your child.
Community Loves spending time with her local church community.
World Traveler She loves to travel.
Staying Active Dr. Kristen and her family love exploring the great outdoors by foot or by bicycle.
Sarah Crain, DDM
Sarah Crain, DDM - General Dentist
Dr. Sarah Crain grew up in nearby Holly Springs, MS. No surprise, she attended Ole Miss where she received a B.S. in Biological Sciences in 2004. From there, she was accepted into the University of Mississippi School of Dentistry and was awarded the Doctor of Dental Medicine degree in 2008.
The following year, she was a resident within the Advanced Education in General Dentistry Program at UMC. Having always loved kids, she decided to focus her career on dentistry for children and began her career as a practicing dentist in 2009.
She is a proud member of the Mississippi Dental Association, American Dental Association and Mississippi Association of Women Dentists.
Dr. Crain recently moved to Olive Branch and attends St. Timothy’s Episcopal Church.
Friday Nights Perfect for pizza and a movie, just make sure you brush afterward!
World Traveler Loves to travel whenever she gets the chance.
True Fan You can find Dr. Crain cheering on the Bulldogs!
Jason Leach, DDM
Jason Leach, DDM - General Dentist
Dr. Jason Leach was born and raised in Jackson, MS. He is proud of his Alma Mater, Ole’ Miss, having earned both his undergraduate degree and his Doctor of Dental Medicine from the University of Mississippi.
Dr. Leach believes in providing the children he serves with the very same treatment he would want his own kids to receive. By all the smiling faces in his dental chair, we think he is succeeding!
A leading dentist in our mobile dentistry outreach program, Dr. Leach is passionate about helping families access critical preventative services for their children. This program partners with our local schools and Head Start to help improve health outcomes for the children they support.
In the mobile program and at the office, Dr. Leach encourages healthy habits that will prevent tooth decay in Mississippi children.
Dr. Leach spends his spare time with his wife and two kids. What could be better than that?
Favorite Movie Bull Durham, sports with a side of romance – something for everyone.
Delivery Order Supreme Pizza, load it up!
Favorite TV Show Dr. Leach enjoys a Netflix series binge when he gets the chance
Sydney Collette, DDS
Sydney Collette, DDS - General Dentist
Dr. Sydney Collette grew up in Kingsport, Tennessee. She went on to study Chemistry at the University of Tennessee. While in her undergraduate studies, she realized she wanted a career where she could help people, work with her hands, and constantly experience new things.
Lucky for us, dentistry checked all three boxes.
Dr. Collette went on to the University of Tennessee Health Science Center in Memphis where she earned her Doctor of Dental Surgery. She was ready to begin practicing as a dentist, but where? How?
Dr. Collette's has a passion for adventure, and it led her to kids dentistry. As any parent can attest, you never quite know what a kid might do or say. Every day is an adventure when kids are in the dental chair!
Ready to Adventure Her favorite place she's traveled so far is Ireland.
Sport Dr. Collette likes keeping active, she's an avid runner and cyclist.
Cat Nap When she stops to rest, she loves to hang out on the couch curled up with a book and her cat, Ollie.
Mary Kate Walsh, DDS
Mary Kate Walsh, DDS - General Dentist
Dr. Mary Kate Walsh grew up just north of the Mississippi border in Memphis, TN. She attended the University of Tennessee-Knoxville where she majored in Biology.
Knowing she wanted to be a dentist, she went on to the University of Tennessee Health Science Center's College of Dentistry and earned her Doctor of Dental Surgery (DDS).
During dental school, Dr. Walsh coached a middle school swim team, and provided hundreds of hours of swim lessons to kids. It was then she realized she wanted to blend her love of dentistry with her passion for helping kids, and decided she wanted to be at a dental practice that focused on kids.
Dr. Walsh is a member of the American Dental Association, Mississippi Dental Association, and Academy of General Dentistry.
Active She likes staying active and is an avid cyclists, snow skier and of course swimmer. But she isn't all about adrenaline as she is also dedicated to practicing yoga.
Giving Back Dr. Walsh is committed to giving back to the community and spends a lot of her free time volunteering for various organizations
Dental Tip Don't believe the commercials, all your child needs is a pinky nail size dab on their toothbrush.