The concept of competition‐during‐heating as a mechanism for TL supralinearity and sensitization in TLD‐100 is re‐examined. It is demonstrated that with this model it is not necessary that the competing traps be removed by radiation in order for supralinearity to be obtained. Furthermore, the arguments for and against the proposal that the precursors to the 5.5 eV centers are the required competing centers are reviewed. It is shown that those experiments which are cited as arguments against this proposal have other interpretations different from those published so far. These new interpretations are consistent with the original view that the 5.5 eV centers’ precursors are indeed competitors to the main TL process. MgOH centers are also likely competitors in samples with substantial OH contents.