Dash’s 30% HP gel is specially formulated and requires no mixing or refrigeration. Dash contains everything you need with pictorial directions printed inside. A non-light activated whitener. Dash features a unique 30 percent hydrogen peroxide whitening gel applied directly from a syringe onto your teeth. Dash in-office whitening includes a special oral gel called Relief ACP, containing amorphous calcium phosphate, potassium nitrate and fluoride, ingredients proven to be beneficial to teeth and for relieving sensitivity.