Inclusion Criteria:  The participant should  be 18 years of age or older, fulfill diagnostic criteria for Tourette's Disorder (from now on referred to as Tourette Syndrome; TS) or Persistent (Chronic) Motor or Vocal Tic Disorder (CTD) according to the DSM-5 diagnostic criteria, have Total Tic Severity Score [TTSS] of >15, or >10 for individuals with motor or vocal tics only, in the past week as measured by the Yale Global Tic Severity Scale (YGTSS) (31) , be able to read and communicate in Swedish and have regular access to a computer connected to the internet, sufficient technical skills to use the treatment platform, as well as a mobile phone to receive SMS.  Exclusion Criteria:  organic brain disorders, intellectual disability, psychosis, bipolar disorder, autism spectrum disorder, anorexia nervosa, or substance use disorders, acute psychiatric problems such as severe depression or suicidal risk needing immediate psychiatric care, severe tics causing immediate risk to the patients or others and requiring urgent medical attention, previous CBT for tics of a minimum of 8 sessions with a qualified therapist within 12 months prior to assessment, simultaneous psychological treatment for TS or CTD initiation or adjustment of medication for tics within the last two months prior to assessment.