How to detect when text is exceeding the TextBox/TextLabel's X size?

Hey all! I know it's been a while since I was on here, but I was focusing on modules, thanks to all of your help! I'm making my own custom chat, due to ROBLOX not being able to tell me when someone is team chatting (If you know, tell me!), so I kind of was aiming at: If they type more than the box's X size, it'll expand. Is there a way to find that, without counting the characters? Thanks for any help!