However,
in case of any significant difference,
the results found by standard addition technique should be more reliable due to the non-spectral interferences originating from cross reactions of aluminum and fluorine with the matrix concomitant.
It should be stated that the values given by the producers on the packages of the toothpastes are only informative
and cannot be used as a reference.
Therefore,
although not being the sole criteria for the accuracy of the our experiments,
it is observed that the results were found quite close to the values given by the producers.