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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I enjoyed meeting Dr. Castleberry! He had a good bedside manner, and communicated well.
Ronda Mocco
I highly recommend Green Lake Dental! Just had My first visit here- and Carissa was fantastic with my teeth cleaning! She was Detailed, professional, has years of experience ,... read more and by far this was The Best teeth cleaning I’ve had yet! Seriously! I am so glad I found this Dentistry! Dr. Castleberry was great! His practice is professional, clean establishment, and the staff was professional and kind!
CRTNY A.
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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Excellent experience!
Erin Maguire
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
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
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My 1st time there. They got me in on time & out fast. Friendly folks. Professional. Clean offices. Good job on my teeth. Pleasant experience. Will return.
Kim “Chytowngal” D
FINALLY! I have had the worst luck finding an amazing dentist and competent staff sine relocating from out of state. The search is now over! Let’s start at... read more the front office. Becky. I’ve worked in patient care and client relations for more than 30 years. Becky nails it! From my very first contact via telephone, Becky actually made me WANT to go to the dentist just to meet her! It was time for my bi-annual cleaning…past due actually because it takes MONTHS to get in most places. Nope. I had an appointment with the Hygienist within two weeks. Becky clearly has the front office handled! Thank you, Becky. Hygienist, Sarah. Equally amazing! She was very gentle and more thorough than any Hygienist has ever been. I’m confident that she polished every single surface of all my teeth! I truly enjoyed Sarah as she is light hearted, easy to talk to and very knowledgeable. Dr. Castleberry. Incredible. Most importantly, he validated issues that I have been having for quite some time instead of brushing off my concerns. He immediately had a conservative plan and approach ready for every single issue. I need a little work and figured it would be this Fall before I could get in. Nope. I’m on the schedule for next week! I hope to continue with Dr. Castleberry’s practice for the remainder of my lifetime dental needs. AND they have a nice, squishy little pillow for your head and neck in the chair and just like when I was a kid, they have many different polish flavors available!! Thank you, Green Lake Dental! You’re doing great!
Sarah Van Den Hout
We would recommend this place! Staff is very friendly and very accomodating to patient needs. It has been a good and pain free experience for myself and my family; thanks... read more for the excellent care!
Mark Schultz
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I was impressed the minute I stepped in the door and spoke with the receptionist. The waiting area is nice and modern and said this place has it together. Jenna... read more was very pleasant and accommodating as she cleaned my teeth. And I found the Dr. very personable.
Nancy Hoover
Dr Castleberry is the best dentist I have ever been too so far in life and the staff were amazing, professional and very personable. I have found my... read more new dentist!!!
Brian Genrich
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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Very good first time visit. Friendly and knowledgeable:)
Suzanne Koch
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
Excellent job! Highly recommend.
David Mack
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.