The Inspired Speaker Academy
No! I don't mean say budder instead of butter! This is about being precise, not lazy. D and T are a plosive pair. That means the only real difference in making them is that one is voiced (D) and the other is unvoiced (T). Other than that, they are exactly the same!
I've been hearing a lot of splashy T's lately, the result of either a lazy or an over active tongue tip. The "splash" is usually caused by the tongue straying too close to the upper teeth, either upon contact or as it releases. The placement of the tongue for the letter T should be exactly the same as for the letter D, that is firm on the ridge behind your teeth. I've included a graphic here because it's hard to explain, please excuse my ineptitude with a pencil....