Review (1/5): disappointed
I bought the 22% gel because it was closest to the 16% that I had used 8 years ago with professionally made trays and to what my dentist recommends.
After 21 days, my teeth are no whiter. I first used this gel by Watts as directed, once a day for 45 minutes. After a week I saw no results. So I increased the amount of gel, still with no results. Then I used it twice a day, and finally used it overnight.
My teeth, which are slightly stained from teas, are no whiter.
My dentist says it takes about 3 months using 16%. He also recommends brushing my teeth within a hour of drinking tea.
I have not used the product now for 3 weeks. My teeth are no yellower than when I started. I am only brushing them after every cup of tea.
The 16% gel I bought from my dentist 8 years ago took about 6 weeks of everyday overnight use to change very yellow teeth (53 years of living and lots of tea) to white. I could see the change on a weekly basis.
Since this stronger product by Watts gives no results in even 3 weeks on less stained teeth, I am very disappointed.