Here are a few cleaned-up, natural-sounding versions you can use — pick the tone you like:
Polished & Clear
“My Nana Swears by This Teeth Whitening Trick That Takes Just 2 Minutes — Here’s How It Works”
Casual / Social Media
“My Nana Swears by This 2-Minute Teeth Whitening Trick. Here’s How It Works.”
Short & Catchy
“My Nana’s 2-Minute Teeth Whitening Trick”
Click-Friendly (but not over the top)
“My Nana Swears by This Simple 2-Minute Teeth Whitening Trick”
Extra Viral Energy
“My Nana Swears by This Teeth Whitening Trick That Takes Just 2 Minutes — And the Results Are Wild”
If you want it to sound more believable, less clickbait, or tuned for Facebook / TikTok / Pinterest, tell me where you’re posting it and I’ll tailor it perfectly.