Bath bombs are single-use blends of fragrant extracts, oils, and scents for your bath. A typical bath bomb includes sodium bicarbonate and citric acid, which interact when dissolved in water to create that signature effervescent effect. As the bath bomb fizzes, it releases relaxing scents and skin-smoothing emollients. Sellers on Etsy have curated extensive collections of bath bombs designed to restore, relax, and turn bathtime into a spa-like experience at home.