“I love this whitening powder. I really noticed a difference on tea-stained teeth. My dentist recently remarked that my teeth looked polished. The only thing I don't like is : I found that with the last tub I bought (from a different chemist) the powder got damp and clumpy over time from dipping my toothbrush in it (even though the brush hadn't been wet beforehand). Maybe a tiny plastic scoop in the tub would help with this issue. A wonderful product though.”