Sweet Tooth (3:43)
IMDb; YouTube

This 2018 short film was presented by Crypt TV in 2020. (I believe it's supposed to be one segment in a forthcoming anthology film called "Bad Candy," and if I ever see that, I suppose I'll delete this entry for the short film.)

A young boy comes home from trick-or-treating, and his health-obsessed older sister gives him a lecture about the many dangers of candy, before dumping it all out in the trash. Later that night, she catches him eating some of the candy, and what she does next is absolutely horrifying. That's all I want to say.