Appointment Hours:
Monday: 7 a.m.-3 p.m.
Tuesday: 7 a.m.-3 p.m.
Wednesday: 7 a.m.-3 p.m.
Thursday: 7 a.m.-3 p.m.
Friday-Sunday: Closed
New Patients
We look forward to making you part of the Green Lake family! To save time at your first appointment, please fill out our new patient information sheet.
About Us
Are you looking for experienced, affordable dental services for the whole family? Green Lake Dental is the place for you. We are a proud, Wisconsin family team serving patients in Markesan and nearby communities with top-quality family dentistry, sedation dentistry, and many other services. We treat our patients like family, and want to be the dental office you turn to for life.
Wondering if Green Lake Dental is right for you? Give us a call with questions today or stop by our office to meet our team. Need more convincing? We bake fresh chocolate chip cookies in the office every day!

Dr. Kevin Castleberry
Wife Amanda, Daughter Johnnie, Sons Elijah, Nolan & Parker
We support Green Lake & the Chamber of Commerce where Dr. Castleberry serves as the Vice President of the Chamber.
A dentist you can trust with your smile…
At Green Lake Dental, we treat our patients with the same care we would provide to our own families. In addition to our passion for high-quality Family Dentistry, we provide the Markesan community with a variety of dental services including teeth whitening, dental implants, and more.
- Root canals
- Dentures
- Emergency dentistry
- Cosmetic dentistry
- Crowns
- Bridges
- Xrays
NO INSURANCE? NO PROBLEM
What Our Patients Have To Say…
Green Lake Dental and Dr. Castleberry are the best! They work hard to make sure your visit is comfortable and they do quality work!

I am a happy Green Lake Dental patient! The staff is warm, friendly and capable, just what one looks for in a dental office.

I was so impressed with the Dental office, Dr. Castleberry, the staff and the care that I received I actually have transferred all my records from Madison to Green Lake Dental.

I’m a big fan of Dr. Castleberry! He was my dentist when I was stationed at Ft. Campbell, KY and has been my best dentist in my 8 years in the army.

Dr. Castleberry explained every procedure that that was done. Questions were answered and I felt very satisfied with his work.

I worked with Dr. Castleberry for 4 years while we were both serving in the Army as dentists. As patients can usually judge character fairly well, I am confident you will find Dr. Castleberry to be personable and trustworthy. He will would never be the type to overcharge or overtreat.

I highly recommend Dr. Castleberry! He is very knowledgeable and takes the time to explain everything in detail and to make you feel as comfortable as possible. From the moment you walk in, you can expect excellent care in a relaxed atmosphere. He truly is going to be an asset to the Green Lake community!

He is a professional, well rounded dentist. He cares about his patients and will deliver quality dental care to people in the Green Lake community.

As a dentist, one of the ultimate compliments you can receive is having a fellow dentist state that they would trust you to work on their friends and family with no reservations. I can say that Dr. Castleberry has more than earned that compliment from myself.

Dr. Castleberry is a wonderful dentist. I have been his colleague for nearly a decade and have reviewed his work first hand. I highly recommend that you visit Dr. Castleberry if you are within 60 miles (or more!) of Green Lake, Wisconsin.

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Everyone at Green Lake Dental is very nice. They go out of there way to be helpful. Claire has cleaned my teeth for many years. She... read more always does a great job! Thorough, very kind. I feel very comfortable and relaxed. Dr Castleberry took over when Dr. Ratering retired. He fit right in and we are happy with the care he provides. 9/6/23 updated I have had many visits with Dr Castleberry since my first visit with him. Two crowns, cavities, and cleanings. The one thing that is so awesome, Dr and his staff use all the latest technology. Very knowledgeable and reassuring minimal discomfort. I know that I am receiving the very best care. If you are looking for a Dentist don't hesitate to try Green Lake Dental!
Deb Trost
I had a great experience with Jackie, at Dr Castleberry's office. She was pleasant, friendly and thorough! I was quite happy with the results.
William Miller
On my first visit, I immediately felt comfortable with the wonderful staff, and Dr. Castleberry is the best. I'd recommend him to everyone. He's not just personable and... read more extremely likable, he's an excellent dentist.
Carole DeCramer
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I had heard amazing things prior to scheduling with Green Lake Dental and it didn't disappoint. From the moment we walked in the door we were greeted with smiles and... read more an obvious and genuine passion for taking care of people. Carissa was the utmost professional, making the cleaning experience nearly enjoyable. Constant communication and engaging conversation helped keep the mind off what is normally an unpleasant experience. She also had innovative ideas as to how we can incorporate flossing into our daily routine. We sincerely appreciate the whole team there at Green Lake Dental.
Mark Wilton
This dental office experience was excellent from beginning to end. The front desk person was SO friendly and helpful booking my appointment and getting paperwork needed. The hygienist and dentist... read more were both very personable and professional. It was so great to go to a business that cares about their customers/patients. Excellent customer service, excellent care with my cleaning. Thank you! Highly recommend
Abigail Ladwig
Very nice place the people are very friendly. And did a super job on our cleaning. We will go back to them for our dental care. And thanks again for... read more the great job.
Anita Tormey
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Dr. Castleberry is a true professional and someone you can trust to help you with your dental care. I have been to many dentists over the years and he is... read more the best! His assistants and office staff are so very nice and treat all their patients with concern and respect. Thank you Green Lake Dental...😊😊😊
Snoop Doggy
I am a new patient to Green Lake Dental. I was impressed with the facility and staff. Very personable and knowledgeable. Definitely recommend and look forward to future visits.
tim paugels
For my first time experience there I would say the Dental hygienist was very good at what she does. She made my first time experience there comfortable and painless. The... read more staff and Dentist were very friendly, and I didn't have to wait very long for my appointment. I would highly recommend this to anyone else.
Terry Harvey
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I’m a new patient at this practice and I’ve been really happy so far. Great front office (including keeping me on a list for cancelations and then fitting me in... read more really quickly), a really positive experience with the dental Hygienist for my cleaning, a really clean and modern office, and very thorough but down to earth explanations from Dr. Castleberry. Glad they could fit me in!
Caitlin Cody
Everyone was professional and pleasant right from making the initial appointment. Jenna was very nice and we actually had a lot in common. She explained everything. Dr Castleberry was... read more very upfront about what needed to be done but did not push and left it totally up to me. It was a great experience.
Susan Schultz
Definitely would recommend Green Lake Dental!!!! What a welcoming, nonjudgmental, sensitive, and caring environment!!! I went in embarrassed as I was very overdue for a cleaning and left with peace... read more knowing that I was in great hands for the remainder of my upcoming visits. I felt heard with my concerns, respected with my minimal pain tolerance, and invested in with the variety of conversations we all had going.
Lynsi Wiles
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We recently moved to the area and I visited Green Lake Dental to have my teeth cleaned . The entire experience was amazing! Sara, Jackie & Dr Castleberry... read more were super helpful, knowledgeable and welcoming. I highly recommend!
maureen jorgensen
Quick and easy! Very kind individuals! They do great work on top of that aswell!
Ryan Betlejeski
Very good first time visit. Friendly and knowledgeable:)
Suzanne Koch
Request an Appointment
Fill out the form below to schedule an appointment.
Note: If you are a new patient, be sure to also fill out the New Patient Forms, by clicking here.
Contact Us
Appointment Hours
Mon-Thurs: 7 a.m.-3 p.m.
Friday, Saturday, Sunday: Closed
(Other appointments by prior arrangement)
No Insurance? No Problem.
Learn more about our cost saving Bright Smiles Program.