Extraction of adult teeth is not part of the treatments an Oral Health Therapist ("OHT") can provide.
OHTs are highly-trained dental practitioners, but like any other part of a dental team, they have their specific scope of practice.
OHTs are focused on preventative dentistry. They are experts when it comes to hygiene treatments and providing dental treatments for children, including extraction of primary/milk teeth. To learn more about their role in a dental team, you can check this article.