What do you think about me being too lazy to get a new toothbrush? I've been swishing toothpaste water for the past 2 weeks.
Why don't you just get a new one?
I've just been too tired to overcome my laziness.
It's easy to fall back on being lazy. But personal hygiene is really important, especially teeth. You don't want to have expensive dental care.
A:My teeth doesn't hurt. I'm assuming no one has noticed my gross self yet.
You should truly consider how much effort it would really take for you to get a new toothbrush. Personal hygiene is essential to your health and your relationships.  It would be worth the effort to get a new toothbrush.