This sounds so weird, but.... Over the last few weeks my cat has lost two of her lower front teeth (she is only a year and a half old) and the two next to the gap are also loose now. She is acting normally, and has no other signs of illness.
I took her to the vet today, and he said it is not completely unusal for cats who chew to loose their little front teeth, because the roots are very short. I trust my vet - and he did say the other option might be an immune system problem, but that would probably have other signs, or gum discoloration, but she is totally fine other than the teeth. Although he didn't take her temperature, he did check eyes, ears, claws, etc.
I am waiting to hear back on a second opinion. I don't want to be paranoid, but I don't want it to be one of those people who say 'they just didn't diagnose it right until it was too late', so I might get a blood work-up done.
I adopted Willy when he was 6 months old, and at that time he didn't have any of his 'little' front teeth. I don't know if he was born that way, or if they fell out. But by the time he was 6, he had ALL his teeth removed. I guess he had really bad teeth, because I'd have to take him in to the doctor about twice a year to have cleanings. Each time, he usually lost another. Finally, I came home one day and he was in obvious pain, so I took him to the emergency clinic. He ended up having surgery the next day to remove his remaining (few) teeth, because they were causing his gums to be infected.
I don't know if this could have been prevented