I'm sorry to say I don't think the tissue/underwear problem ever really goes away. I have a 1.5 year old and she's the best, never chews up shoes, purses or anything that isn't hers EXCEPT my underwear and tissues. I have a ton of crochless undies that I had to throw out. She came into the living room wearing my thong on her head the other day, good thing it was just me and my boyfriend
I just laugh about it now.lol