>carbamide bleach seems to come in varying strengths
>like 22% and 16% etc.
>
>Is there a sensible guideline for age, gum health
>over whether a higher strength 22% or 16% is used on a patient
>aside from the evident staining on the teeth.
Go with the sixteen ,,,,,,,,, the 22 may make the teeth overly
sensitive ......... (sometimes the 16 does too!).
Joel