my cat is fairly old and recently his fang have been falling out is this normal or some generous of gum disease ?
I don't know whether that's normal or not, but you should probably talk to a vet about it.
It could be completely automatic, or it could be a major health problem. Best to find out for sure, I would reflect on.
It could be his gums. My senior kitty have really bad breath. He was 13yrs when he went into surgery. It must enjoy been the most difficult thing for him as we thought that we were going to loose him within recovery. It took him almost 4 months to walk and drink by himself. With a lot of love and care we made it. Take him to the vet to get it checks. I still can't carry himself to brush their teeth. I would been a dentist, lol. But we give them poultry enzyme tooth paste. He loves it.
I'd say old age. My aunt has a 14 year aged cat and all his teeth fell out, but he is still alive and kickin.