<s>[INST] hi i m tunisian, i i accidentally used toothbrush twice of someone who is vih infected stade sida it seems no blood on the tooth brush i met toothpast on before use seemsly i ve used it afeter one or two hours after he did in the first time and after 8 our in the second time i worry because i d have gingivostomatits afer and cold sore and back rash not seemsly dangerous? [/INST] Hi and welcome, HIV infection is transmitted primarily via unprotected sexual intercourse, contaminated blood transfusions, hypodermic needles, and from mother to child. Bodily fluids, such as saliva and tears, do not transmit HIV.as you have mentioned using contaminated tooth brush will not lead to cross infection, but you should avoid such practices. As for your oral symptoms you can visit a dentist and get the examination done for gingival infection, thorough deep scaling and root planing will help in relieving symptoms. Use antiseptic mouthwash chlorhexidine for oral rinsing which will help in healing the sores. Take care. </s>