What should I be doing? To be clear, he is a very active cat that still climbs things for favorite nap spots. He is easily 11 years old, but considering the circumstsnce I got him under, would not be shocked to find he's up to 13 or maybe even 14. He comes over to meow at me for attention which is very normal for him and I see he's missing a lower fang.

I'm a bit freaked out but he doesnt seem to be upset. Right now he's calmly sitting in my lap like it's a nornal day, not really making any noise and just relaxing.

Should I be doing something? He normally gets plenty of water and dry crunchy food. Should I change this over to soft? Is it normal for cats of this age to just randomly lose a tooth?