In my understanding, traditional speech therapies are less often recommended by researchers. Speech therapies recommended by researchers include operant methods (such as [Lidcombe](https://www.uts.edu.au/sites/default/files/2018-10/Lidcombe%20Program%20Treatment%20Guide%20December%202017.pdf)), computer technology, and otherwise CBT - to reduce stuttering or prevent chronic stuttering, see: [https://www.sciencedirect.com/science/article/abs/pii/S0094730X2300058X](https://www.sciencedirect.com/science/article/abs/pii/S0094730X2300058X)