As a speech therapist, I would say that you should consult one when/if your stutter is bothering you, you are motivated to learn some tools for managing it, and you have the time/mental energy to practice those tools. Speech therapy for stuttering (beyond the preschool years*) is not, and should not advertise itself as, a “cure.” What it can do is teach you tools for controlling and managing the stutter you have, including both the physical mechanics of your mouth and the social/emotional aspects of it. *Stuttering intervention for preschoolers can appear curative, though it’s often behavioral and so it’s hard to say whether it actually “cures” the stutter or just teaches really effective masking. In general, the rule of thumb for whether to take a young child to speech therapy for stuttering, is if the stutter has persisted for >6 months to a year and/or if it’s accompanied by strong negative feelings or secondary struggle behaviors.