So she stuck the teeth in styrofoam, applied the whitening strips per manufacturer instructions, and added some artificial saliva: a liquid mixture at the pH and with salts you'd find in regular spit.

因此，她将牙齿粘在聚苯乙烯泡沫塑料中， 按照制造商的说明涂上美白条，并添加了一些人工唾液：一种具有 pH 值的液体混合物， 含有普通唾液中的盐分。