This is NOT true! There is a very general belief that a hypnotherapist can “implant” false suggestions in a client that is not to the benefit of the subject. The hypnotherapist can only “implant” suggestions acceptable and believable to the client for the benefit of the client.
A belief that a hypnotherapist can just snap their fingers and the client will be in a deep sleep, which is not technically correct. Hypnosis is a contract between the client and the hypnotherapist where the hypnotherapist will give the client instructions to follow to ensure the client will experience all the wonders of the unconscious mind like relaxation, pain control, habit change, stress control, etc.