These are available:

saundragoodman.com (sandragoodman.com is taken)
teethforyou.com (teeth4you.com is taken)
teethsurvivors.com
toothsurvivors.com

I kind of like the last two. You use one as your domain, and you point the other to your main domain just in case they think it's tooth instead of teeth.

You ought to reserve your own name as a domain while it's available - costs just $9.35 per year if I remember right. Too bad Sandra is taken, or I would say just use your name. But you're right, too many people would misspell it and go to the wrong place.

Good luck!
Kathy