No staining. The foam is designed to dissolve completely and rinse away with regular water. Your white tub stays white, and your kid's skin won't look like they wrestled with a unicorn.

4 Bath = 4 separate bath experiences. Each flask is a single use that creates one epic foam eruption. So you're looking at about a week of cooperative bath times if you use one per night, or you can space them out as special occasion bribes

It's non-toxic and formulated knowing that kids taste everything, but we're not calling it a beverage. The ingredients are safe if ingested in small amounts (think accidental gulp while playing), but this isn't flavored water. Keep the flask out of reach once it's empty - the powder inside should stay in the bath, not in their mouth.