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Abnormal Molar Development in Dogs

Dilacerated Mandibular First Molar in Dogs

Dogs, particularly small breeds, often encounter an oral health complication known as dilacerated mandibular first molar. This issue involves the abnormal development and formation of the mandibular molar, located three teeth away from the midline of the jaw. The mandibular first molar is significant as it’s among the earliest permanent teeth to form, boasting a sizable calcified crown.

While there’s no specific gender or breed predisposition, small breed dogs face higher risks due to limited space in their jaws for proper molar growth. Consequently, it’s generally advised to subject small breed dogs to a comprehensive evaluation of their mandibular first molars during their growth phase.

Symptoms and Types

The anomaly manifests at the neck of the mandibular tooth, frequently accompanied by evidence of gum recession. Extensive bone loss near the root may occur, potentially leading to exposure of pulp within the tooth. X-rays might indicate discontinuity between the roots and crown, and/or the presence of pulpal stones in the tooth’s canal or chamber.


A potential factor contributing to this developmental issue is the mechanical constraint, such as insufficient space, within the mouths of small dogs, hindering the appropriate crown-root development. Invagination, which involves the folding in of the enamel and/or cement of the tooth, occasionally happens at the tooth’s neck, often accompanied by some level of gingival recession (gum recession) at the affected site.


Your veterinarian will conduct a comprehensive physical and oral examination of your dog, considering any relevant background history of symptoms. Dens-in-dente, a developmental anomaly resulting from the enamel deepening into the dental papilla (the cells involved in tooth development), typically initiates at the crown and may extend to the root before dental tissue calcification occurs. Traumatic injury to the tooth, possibly resulting from aggressive deciduous tooth (baby tooth) extraction, could be associated with compromised dental integrity.

If the veterinarian determines that the tooth is too damaged to be preserved, an assessment of the remaining mandibular bone becomes crucial before considering extraction. The diagnostic process will involve obtaining a dental X-ray to assess the extent of changes, particularly at the roots.


Treatment for a dilacerated mandibular first molar typically commences with appropriate pre-operative antimicrobial and pain management therapy as deemed necessary. In most instances, there are indications of a non-vital pulp in the tooth, evidenced by a wide canal, periapical (root apex), and bone loss. Tooth extraction is usually the recommended course of action, though it should be approached cautiously to avoid aggressive procedures. Care must be exercised, as osteolysis (active bone tissue resorption or dissolution) could lead to compromised mandibular integrity (lower jaw). Your veterinarian might consider utilizing bone-promoting materials following extraction.

Although uncommon, an endodontic procedure may be attempted to salvage the tooth in cases with minimal pathological changes. Additionally, the presence of stones in the tooth chamber could complicate canal access.

Living and Management

Your veterinarian will provide pain medication to alleviate your dog’s discomfort and promote normal eating. Following initial treatment, your veterinarian will schedule a follow-up examination to ensure there is no infection and that healing progresses as expected. The prognosis for retaining the tooth is uncertain. However, the long-term health outlook for affected dogs is generally fair to good if tooth extraction is performed.

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