Not at all. Our Teeth Whitening Powder is free from peroxide, PEG, parabens, and phthalates, ensuring a gentle whitening experience without causing sensitivity or gum irritation. Additionally, our formula contains Strontium Chloride Hexahydrate, an ingredient most commonly found in sensitivity relief toothpaste. It works by forming a protective barrier over the delicate nerve endings in your teeth, ensuring a comfortable and pain-free whitening process.