It's interesting that you compare OCD with stuttering. In this reddit [post](https://www.reddit.com/r/OCDRecovery/comments/xjsttj/tips_for_stutteringocd_observing_triggers_not/) is explained how stuttering and OCD are similar. That post basically explains that the popular advice of speech therapies to desensitize is ineffective because it is counter-productive towards [inhibitory learning](https://iocdf.org/expert-opinions/the-inhibitory-learning-approach-to-exposure-and-response-prevention/)