that I live in apartment with another man ( I know he has some unprotected encounters ) I was confused that ,just before writing this question I took shower and I afraid I may accidentally left my tooth brush and use his tooth bruth also the colours are different , what ever , I think the time between him and me to take shower about 25 mintues . and of course his tooth brush washed by him after his shower coz that as I remmeber .
My questions here ? If I wrongly used his tooth brush :
1- Is that risky ?
2- What maximim tirme That HIV lived out side the human body ? ( of course water applied to his tooth after finished as usuall , no obvious blood as I remmeber) , Is that will kill or help to reduce HIV if present ?

Again thanx , for your comments and replies .