Get a Second Opinion and get a X-ray done.
TJ lost all his baby teeth at around 8 months old. He retained his 4 fangs, and his adult teeth came in, actually, only a few adult teeth came in. He has all his fronts and only a few in the back. He is missing all his sides (up and down). When he was 1 year old, I brought him to the Vet to get his baby 4 fangs pulled. He did that and took an xray, that showed the rest of his adult teeth just did not form from his jaw bone. Never said anything about a short life span
The Vet actually said, maybe this is better, less teeth to cause tartar and plaque and infection issues
