I tried the crest whitenstrips professional when it was on sale. It works but hurts. I used only 4 or 5 of the strips and gave up. It makes my tooth very sore and sensitive and lasts 1-2 days. However, you can see the whitening effects even after several usages.
【在 u**r 的大作中提到】 : I tried the crest whitenstrips professional when it was on sale. It works : but hurts. I used only 4 or 5 of the strips and gave up. It makes my tooth : very sore and sensitive and lasts 1-2 days. : However, you can see the whitening effects even after several usages.