It's for 13+ for starters, and has been described as a 'hunting' ground for predators. And has just been banned in India completely.
This below is from 'Techcrunch' which actually gave it a really positive review compared to Youtube and others for kids.
The main issue as always is DO NOT let your young children have unfettered access to the internet, on social media accounts or any other platform. Tiktok says it's safe and kid orientated which relaxes parental guard but it IS NOT because it is the internet and it will attract people ( paedos or older kids having a 'laugh') who are not safe for your kids.
''The app has also been the subject of troubling reports about its dark side, which is reportedly filled with child predators, devious algorithms, dark patterns, and teens bullying and harassing one another. It’s not clear, however, that TikTok’s affliction with these matters is any worse than any other large, social, public-by-default app of its size.
It is concerning, however, that under-13 kids are setting up social media accounts without parental consent. '