Which is the best product to have for lips
Teosyal has not yet been approved by the FDA in the United States. You may want to check on its approval in the UK. Juvederm or any other approved hyaluronic acid filler will do the job. The more important factor is your doctor and her/his technique.
Teosyal is a hyaluronic acid filler not available in the US, but should be an excellent choice if the injector you choose uses it and has excellent results with it. The challenge is selecting an injector. That physician should be an expert who has done filler injections for a significant time and understands the anatomy where you wish it placed. (See ExpertInjector.org)