I have to agree with Sandman and LeeD. It's not so much that he doesn't floss...it's that his failure to floss and Michelle aren't compatible. It's not that he's gross, it's that he's failing to do simple, basic measures in order to make his partner happy. While I usually advise people not to change for their partner, something as basic as hygiene? I can advise that.

I realize their's a child in the relationship, and I hate advising a separation of married people...I usually don't, either by not posting or offering alternatives. My best shot would be to tell you to try to enroll either him or the both of you in some form of therapy: couples for the two of you, behavioral for him. Both couldn't hurt. Outside of that...you shouldn't be forced to suffer because he's too lazy to walk an extra five feet to the trash can, to be quite honest.

Please take care, and know I wish you my best.

Hugs,
Harley