Yes, a 12-year-old can use TikTok. However, it is important to note that TikTok's terms of service require users to be at least 13 years old. This means that technically, a 12-year-old should not create an account on the platform. That being said, many young people under the age of 13 do use TikTok with their parents' permission and supervision. It is important for parents to be aware of the content their child is viewing and posting on the platform, as there is a wide range of content available on TikTok, some of which may not be appropriate for children. TikTok also has safety features such as restricted mode and family pairing, which can be helpful for parents in monitoring their child's activity on the app.