There will be no cake special effects when brushing the phrase "Happy Birthday", but there will be fireworks special effects when chatting with others to send a happy birthday.
Tik Tok special effect: 1. Open Tik Tok App, click the plus button, press enter to shoot video, and then click the checkmark to confirm; 2. Click the "Special Effects" button at the bottom, select the special effects to be added, and press and hold to add and preview them in the video; 3. Click "Save" to preview the overall effect of the video, and click "Next" to publish.