It may or may not be benign. But I know that fluoride prevents cavities by reinforcing your enamel and that's why the ADA recommends it. So whatever the accumulation of fluoride does to my pineal gland, I'll trade that for the protection fluoride affords.

I know unfluoridated toothpastes are clinically proven to work in cleaning your teeth. But I need anti-cavity protection too.

(My mom's a dental hygienist. She'd kill me if she found a cavity.)