What does the effectiveness of a bleaching gel depend on?
The key factors that affect the effectiveness of hydrogen peroxide-based bleaching products are concentration and time.
Higher concentrations lead to quicker results than lower concentrations. However, by extending treatment times, the effectiveness of products containing lower concentrations should be similar to that for products with higher concentrations.
The use of high concentrations of H2O2 and extended times may play an important role in the processes that lead to immediate bleaching results that are, however, temporary.
In fact, it will produce an unnatural and short-lived white that will disappear when the teeth rehydrates.
In addition, dehydration significantly increases the risk of sensitivity.