Awesome for teeth and transition to regular cup! I have bought several 360 cups for my toddler and we love them! Though they do have their pros and cons, for the most part everything is good! They have been a life saver on my kiddos teeth and have also helped transition to an actual regular cup! Also easy to dissemble and clean. Cons, they do wear down fast which if thrown on the ground hard enough they do leak. Also the seal that are on the lid that keep it separate from the cup and lid it's clear, you have to remove that every time you clean or else gunk will build up in it and bacteria and no one wants that for their babies! Other than that it's been a life saver for my kiddo! Easy to learn, awesome color selection, not to bad in price! I would recommend the item!