The firm says European users' data is now migrating to servers in Dublin, as part of its ongoing response to data privacy concerns around the video-sharing app's links to China.
TikTok, which is owned by Chinese firm ByteDance, says it has never given data to Beijing.
Critics fear that the Chinese state could request access anytime.
The video-sharing giant is also allowing a European security company access to audit cyber-security and data protection controls.
