If someone should ask you if you can share your toothbrush with your partner be it your boyfriend/girlfriend/husband/
Except you do not have intimacy with your partner and do not exchange any body fluid such as saliva or blood, I would agree with your response but if the reverse is the case, you should better start sharing your toothbrush with your partner. Whatever your reason for not wanting or cannot share your toothbrush with your partner might be, it may not be a valid reason to me.
You may want to claim that it might disgust you considering he/she might be brushing the “inner caucus” lol of his/her mouth but please let me ask you a question? When you guys have a French kiss, was there no saliva exchange? It wasn’t disgusting to you then simply because you were in the mood and very horny? Weldone sir/ma.