  We consider the breaking of the global conservation of gauge field charges
which are commonly thought to survive the spontaneous breakdown of gauge
symmetry brought about by Kalb-Ramond fields. Depending on the dilaton field
and also the size of the compactifying space, the global charge breaking may
take place due to world sheet instantons. In going to 3+1 dimensions one could
have a serious problem in order to produce the hierarchies between the quark
and the charged lepton masses using the mass protecting charges with the
Green-Schwartz anomaly cancellation. Various unnatural features of this type of
models are discussed.
