Are you specifically asking about HIV infection?
If so- the risk from a toothbrush is negligible.
Fist off, you would need to be infected- which it sounds like is quite unlikely.
Then, for any risk, the toothbrush would have to have blood on it - such as if you had gum bleeding, and then someone else use it within a couple hours before it dried up ...
The sequence of these events are quite improbable and unlikely.
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