In simple words, efflorescence is not a very serious problem, but it can create some severe problems if ignored over time. First of all, there is an esthetic problem if efflorescence occurs. As efflorescence is a sign of excessive moisture attack on structure, so not addressing the problem can lead to some unpleasant surprise like structural damage or mold formation. Efflorescence results from moisture. Sometimes salts inside the structure react with the other structural materials and can damage gradually.