As with any treatment, your safety and final results depend entirely on the skill of the doctor performing it. Providing you work with an experienced medical practitioner, Silhouette Soft and PDO Thread Lifts are highly safe treatments with proven results and success. The main substance of both thread lifts treatments, polylactic acid and polydioxanone are fully absorbable by the body. The treatments are also performed under local anaesthetic, meaning no sedation is necessary. You doctor will go through the full list of risks and benefits of the treatment at your consultation prior to treatment.