The American red cross recommended that person living with AIDs patients should not share razor blades and toothbrushes. It is safe,however, to share bar soaps and hand towels. Explain the difference.
Using bar soaps and hand towels won't have a greater chance of making you bleed, but razor blades and toothbrushes do since people usually cut themselves when shaving and toothbrushes can make your gums bleed.