Lingually Displaced Deciduous Canines (LDDC) is a genetic condition where a dog’s lower deciduous canines (baby teeth) are growing into the hard palate (top of the mouth). The teeth are growing too far towards the tongue (lingually). Puppies with some degrees of LDDC cannot close their mouths without these teeth contacting the soft tissues of the upper hard palate and can cause discomfort.

The term Lingually Displaced Deciduous Canines (LDDC), is now referred to as Linguoversion of the Mandibular Canines (LMC) to describe this condition.

Reasons to remove these teeth

Here are some reasons to remove these teeth:

• Teeth growing into the hard palate can be painful for the puppy

• If these teeth are removed at a young age, it can improve the chances of the permanent (adult) canine teeth erupting in the correct pathway

• To stop these teeth affecting the normal growth of the jaws

It is important not to delay treatment of deciduous canines as the window of opportunity is only a matter of a few weeks until the permanent canines erupt at 22 to 26 weeks of age. If the adult teeth erupt lingually their contact and therefore damage to the soft tissues can be far more significant. Treatment of lingually displaced adult canines - or Linguoversion of the Mandibular Canines (LMC) - involves endodontic work and generally this is done by a dental specialist (with specialist costs!)

We offer free puppy checks. This is where one of our vets will check for this condition when they examine your puppy, as well as give a full health exam and advice.

Options if adult teeth grow lingually

Partial Crown Amputation/Crown extensions

This is the favoured option and involves reducing the height of the lower canines to that of the adjacent incisors. This is a sterile procedure to reduce the height of the canine crown that exposes the pulp. This is a very delicate procedure and carries high success rate. The intention of the procedure is to keep the pulp alive and allow the shortened canines to develop normally and contribute to the strength of the jaws.

In order to monitor this process of maturation the teeth need to be radiographed at four to six months post-op. At this current time, Coquet Vets cannot perform this procedure, but refer to a vet that does (Dental Vets, Scotland). An alternative treatment is to use crown extensions which can act like a brace to pull these teeth into the correct position. This is also something that would need to be done at a dental referral centre.

Surgical Extraction

This is the complete removal of the canine(s) in question. Surgical extraction of the canine may seem attractive as the problem is immediately dealt with, without the uncertainties of orthodontics. However, the loss of the tooth can cause weakness of the jaw(s).

The canine teeth are functional teeth - by this we mean they are needed to keep the tongue in place, hold balls / toys / birds, as well as play, and therefore this is to be considered before extraction is performed.

This is an inherited condition - an autosomal recessive mutation. Both parents may look normal but carry recessive genes for the condition. When this genetic information is passed onto the litter approximately one pup in four will appear abnormal, although all will carry the recessive genes for the condition. If this condition appears in the litter the most responsible course of action is not to breed from the parents again. All the normal looking pups also carry the recessive genes so they too should be neutered to prevent the problem passing back into the gene pool.

If you are a client at Coquet Vets and this article has raised any concerns or questions, don’t hesitate to call us on 01665 252250 or email us at info@coquetvets.co.uk

NOTE: The term Lingually Displaced Deciduous Canines (LDDC), is now referred to as Linguoversion of the Mandibular Canines to describe this condition. (Article update: 24/05/23)