The basis for cementum annuli aging is the cyclic nature of cementum deposits on the roots of mammals’ teeth each year, which results in a pattern of “rings” in the tooth, like those formed in the wood of trees. A darkly staining ring, or “annulus”, is formed during winter on most all whitetail deer and other mammals. Abundant, lightly staining cementum is formed during the growth seasons of spring and summer.

To obtain the most accurate age for your whitetail deer and other game, the teeth are put through several chemical processes and then sectioned thinner than paper using advanced histological techniques. We have tirelessly perfected our techniques and staining protocol to ensure we have dark lines every time making determining the age that much easier. We then digitally scan the teeth using high throughput quality optical scanner to count the cementum annuli rings microscopically. One of the features that sets us apart is our high tech laboratory where we deploy the newest laboratory technology to ensure accuracy.

See the image below as a demonstration.

The cementum-annuli (cross-sectioning teeth) method of aging deer, elk and other wild animals is much different. It first requires decalcifying the central lower incisors (sometimes the M1 molar or other tooth) and then cutting cross-sections of the root tips to a thinness measured in microns. The slice of tooth is then placed on a slide and a special dye is added to enhance viewing. It is placed under a microscope. Lines within the tooth’s diameter are readily visible and can be counted much like the rings of growth on a tree, indicating a deer’s age.

Tooth eruption or tooth replacement is a highly reliable way to age mammals until they have all their permanent teeth. In whitetails you can accurately place deer as 6 months old, 18 months old, or 2 ½ or older using this easily learned technique.

This is probably a good time to bring up one of the most popular and prevalent myths of how to age game mammals, molar wear aging. This technique suggests that we should be able to determine the age of a mammal by looking at the wear on the molars. Sort of like determining the age of your tires by tread wear. In the same study by Hamlin referred to above; the accuracy of molar wear aging was 62.3% for mule deer, 42.9% for whitetails, and 50% for elk in the 3-4 year classes, 16% for elk 5 years old. They ultimately concluded that “The accuracy provided by the cementum annuli method is necessary to determine whether various physical and population parameters change significantly with age of the animal.” So what is the source of this popular myth of molar wear aging? In 1949 Wildlife Biologist C.W. Severinghaus published a study “Tooth Development and Wear as a Criteria of Age in White-tailed Deer” Journal of Wildlife Management 13:195-215. In this study he suggested two methods of aging; Eruption or tooth replacement aging and Molar wear aging. Subsequent studies since 1949 have supported his eruption aging results, but no study has been able to validate his hypothesis concerning molar wear aging. In fact in addition to the Hamlin study cited above here are some more comments by wildlife biologists in recent years:

….this widely used technique (molar wear) is very inaccurate for classifying adult deer…. (Ken Gee, Wildlife Biologist, Noble Foundation Wildlife Unit 1996 study)
We believe age-specific information and conclusions drawn….using the tooth-wear aging technique to “determine” ages of adult white-tail deer are unfounded…Review of all other published data sets using known-age deer supports this conclusion.(Wildlife Society Bulletin 2002, 30(2):387-393 Ken Gee et al.)
Ages assigned by … wear criteria were not reliable….. (Kenneth Hamlin et al. 2000 Journal of Wildlife Management 64(2):441-449)
….we conclude that tooth replacement and wear should be used for deer <2-1/2 years old, while cementum annuli should be used for deer >3-1/2 years old. (Mickey W. Hellickson, Ph.D. King Ranch Chief Wildlife Biologist 2007)
Curiously this molar wear aging is still part of the course curriculum taught to current wildlife biology students. That is probably a key reason that the myth continues.

In conclusion, if someone wants to really know the age of mature trophy game mammals, the only choice is cementum annu

We are currently accepting them and they just need to be sent to the new address which is 2814 Brooks St. #114 Missoula, MT 59801.

If you sent teeth to the former Texas address the mail forwarding ended in June 2018 and the teeth will be returned to you by the United States Postal service. Just re-send them to the new address and we apologize for the inconvenience this may have caused you.

Place your order online and we will send you an envelope with instructions on how to package the teeth. In the mean time if you have already extracted them place them in a PAPER envelope and no plastic with a bit of salt to remove the moisture. We cant stress enough how plastic is not recommended. It accelerates the decomposition process and causes bacteria to grow. Allowing the sample to dry in a paper envelope allows for a dry stink free sample. Your postal worker will thank you and so will we!

If you accidentally broke a tooth on extraction the best course of action is to saw off the whole front mandible and send the entire front row of teeth. An extra $5 will be automatically charged to your card at check in and we can ensure we get the roots we need. To read more about how to extract and prepare the teeth for shipping click here.

When you place your order online a kit will be mailed to you with a return envelope. You can then ship via whatever carrier you wish and we recommend using tracking! 

Then ship within the US to:

Wildlife Analytical Laboratories
5840 Expressway Ste 1B
Missoula, MT 59808

From Canada Please see our Canadian Shipping regulations first by clicking here

Outside the US and Canada please visit the International shipping information page by Clicking HERE

We offer commercial accounts for large volume clients such as taxidermists, Ranchers, Outfitters and Researchers. Please contact us at customerservice@deerage.com to see if you qualify for a commercial account. There is no base line volume discount.

What we mean by Respect/Honor is that for many hunters/wildlife stewards knowing everything possible about the life and condition of the harvested animal is just one more way to have the taking of the animal’s life be respectful and appreciative. The accurate age is one element of this knowledge.

Harvest Criteria refers to learning how to accurately age the animal prior to harvest and then verifying that decision after the fact. One way we know to communicate this is by way of an analogy. If you were a master gardener and your passion was growing tomatoes you might have as an objective raising the largest, most beautiful tomatoes you could. In addition to genetics and nutrition (soil, fertilizer and water) you would want to learn the right time to pick or harvest these tomatoes. You wouldn’t want to pick them too early or too late. Experience of picking too early & too late, over time, would allow you to do a better job at maximizing your goal—having the largest, most beautiful tomatoes you could. Whitetail deer hunters and managers have goals for bucks that are very similar to these master gardeners. They want to have the bucks they harvest achieve their maximum potential. In a whitetail that usually occurs when they are 5-6 years old. They want feedback on the deer that they harvest about how good their judgment was this time, so that they can learn and improve their skills at judging age before they squeeze the trigger or let loose of the arrow.

Scientific Management Data refers to the need to know the age of harvested mammals so as to collect data that enables correlation between habitat and the health of the mammals in that habitat. Body weight vs. age is a critical indicator over time of changes in habitat conditions either good or bad.

Henry Chidgey founded Wildlife Analytical Laboratories in 2004 with the goal of ensuring every hunter can get an accurate age on their whitetail deer while receiving exceptional customer service. He put together this guide on how to age your animals after harvest.

Click here for pdf file on “How to Age Harvested Game Mammals”