If you're looking for a show that you'd find on the Disney Channel or Nickelodeon that's technically geared toward preteens, Sweet Tooth isn't it. According to Netflix, Sweet Tooth is rated TV-14, which means it has subject matter that many parents might find unsuitable for kids under the age of 14.
Parents gave their input about it on Common Sense Media, however, and most have said Sweet Tooth is fine for kids ages 11 and up. Children hybrids are shot at in the show, there is mention of kids being killed, and there is general violence, but no dead bodies of kids are actually shown on-screen. There are also a few swear words thrown in across the eight episodes, but don't expect any f-bombs.
When it comes down to it, parents will need to use their best judgment based on what their own kids can handle. What one 10-year-old might be able to watch, another might be far more irked by. To be safe, Sweet Tooth definitely isn't for little ones who are still working on even sitting through an entire hour-long episode of a show. But most older elementary and middle school–aged children will likely be able to handle it.