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I would agree that the active time for whitening material is between 1-2 hours. After that you really aren't getting any benifit.
After about 90 minutes there is no benefit to the whitening gel. Some minimal whitening can occur after 60 minutes but it can also lead to increased sensitivity.
Hi:It appears you have decalcification on the tooth. This can also happen as a result of trauma while the adult tooth was developing. Normally nothing has to done unless it develops into a cavity.Best, Dr. Maddahi
Hi:It's best to go back to your dentist to evaluate the stain. Most likely he will be able to remove the stain with simple polishing.
I agree with Dr. Maddahi answers that without seeing your teeth it is difficult to give you correct advice but as per my opinion you should not use whitening strips on chipped tooth and visit dentist for the appropriate treatment. Dental bonding is the treatment that will fix your chipped tooth.
