I have browsed the forum before and while I have been reassured by some of your responses I would like to verify a couple things for complete peace of mind. 

You both said that blood borne viruses (HIV in pariticular) cannot survive on inanimate objects and cannot infect within minutes of being out of the body. But every single source online says that razors and toothbrushes are a theoretical risk. 

My question: 

Is there risk only if contaminated blood or fluids are fresh and if the object is used immediately after? (Within minutes, not hours or days). 

The reason why I ask is because my gums were bleeding after using a floss pick and I am worried about any risk. 

I would like to be clear that I did not see any visible blood on it, but unsure if I would have missed any other fluids. I also ran it under water for a bit before using. 

My SO has been using those floss picks for 2 weeks now and guaranteed that there was nothing wrong with the package and that it has been left in our bathroom in unsealed bag. The air exposure would have killed the viruses in this case, even if a bathroom is usually a humid place with not the best ventilation, correct? I ask because we bought those from Amazon and it’s not unheard of for orders to be tampered with.