I am very satisfied with these tapes simple, break 1 h but not me its not my géner ... I held for this read menage Temp. Deja SEVERAL days I use it and really I see already the result! Basic jai teeth too yellow hue instead of the normal email with a regular brushing of course not limited to cigarettes and coffee and tea will be the result after all depends on tooth enamel are very yellow if the effect will be less visible and you should do the treatment on a lomgue duration every month I think 4 months is close to contact effects. I am very surprised I did not expect such a result. I use toothpaste diamond email you and I in my diligent brushing. The is the key