Student’s experiment turns him into adult

i saw this movie once on tv in the early to mid 90s. The basic premise was a high school student had a science experiment where he was trying to speed up plant growth or maybe grow super large plants. The experiment goes wrong and he is turned into an adult and pretends to be a teacher at his school where he falls in love with one of the teachers. Later he figures out how to reverse the experiment and turns back into his student aged self. The female teacher he fell in love with discovered his secret and the movie ends with her showing up in his class as a new student after she used the Experiment to turn herself back into a student. I’ve never seen the movie since and can’t find a name for it anywhere. Any help would be greatly appreciated. Thanks!

5 thoughts on “Student’s experiment turns him into adult

    1. That’s it!! Amazing. I’ve spent years trying to figure this out. You got in less than 24 hours! Thank you so much!

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