Is DIY tips for teeth whitening really effective? I'm considering teeth whitening as one of my friends suggested to go for a professional dental care, City Oasis Dental in Toronto. How much does it cost? I have heard many mixed comments regarding DIY tips. Can anyone recommend some good and effective DIY tips for teeth whitening? I'm not able to make a decision on this. I'm researching more about professional and DIY teeth whitening. I would like to know your opinion also. Thanks!!