Extra-curricular activities can serve as brilliant developmental pathways for any student. You can learn a variety of skills via activities that really interest you. They can help you with life skills as well as prepare you for the world of work. When writing a personal statement, it may be useful to highlight how your involvement in extra-curriculars will benefit you as a dental student, as well as any important lessons you have learnt. In addition to being developmental, longer-term participation in extra-curricular activities shows commitment - a key characteristic for a dental student, especially with dentistry being an intense 5-year course!
You don't have to include EVERY extra-curricular actitivty that you have ever done in your statement! Maybe just include the ones that help you to demonstrate how you may be well-suited to studying dentistry.