Saliva as lubricant

Mallory • 27 year old 👩🏻 Vet Tech 🐶Married to my amazing husband 💍 Hayden Lois 12-24-17 💗 Treyson Allen EDD 2-10-20💙
My husband has been using saliva as lubricant when we BD. I have heard that saliva as lubricant can kill sperm... is that true? Or have you used saliva as lubricant and gotten pregnant?