Philips Sonicare 3100 Series

The Philips Sonicare 3100 is a step up from the 2100, offering a slightly more robust build and a few extra features like a pressure sensor that is more sensitive. It is a great choice for older children or teens who want a reliable, high-performance brush without the 'kiddie' branding. It provides excellent plaque removal and is very gentle on gums.

While it doesn't have the bells and whistles of the kids' specific models, it is a solid, long-term investment that will last well into adulthood. It is a no-nonsense, high-quality tool for serious oral care.