I don't quite understand what you mean by dental abnormalities, what is wrong with your dogs teeth. I haven't had any problems with my dogs teeth but I would have my vet check them over first. I do know some dogs retain puppy teeth and they will have to be extracted by a vet just as twills has stated.
I was told by my vet initially that Louie will need braces! But I think she meant if his puppy teeth won't fall out - which tool a very long time. For his last puppy canine I took to manually wiggling it several times a day... until it finally gave in a spirited tug of war! His teeth have been fine since.
Depends what you mean by "urgent"? If the dog has had a tooth knocked out, broken or displaced, etc. that is an emergency that needs to be seen ASAP. If it is a retained tooth, base narrow canines, etc. it is a different story.