If your talking about ballet slippers than yes, they are worth it because no dance class will allow you to take ballet without them. They allow you to move around easily and perform spins and jump that you are not able to do without them, also if they are full soles they make it harder to pointe causing your foot to work harder and build strength. If you are talking about a soft block shoe then they are merely used to get used to the feel of a pointe shoe.
I personally don't think those are necessary, I went right from ballet slipper to pointe shoe and my school never uses them and I do ballet intensively. As for ballet slippers they are simply required and you are expected to have them. Soft block shoes should only be bought if your teacher says she wants you to use them because they don't have much of a purpose.
Also 'abcdefghijklmnop' is completely wrong. Ballet slippers are used for practice, bar, and also if you aren't experienced enough to go en pointe (3-5 years minimum ballet experience) and 'going up' on soft block shoes or ballet slippers is incredible dangerous and anyone who's done ballet enough never does this because its dumb and will cause foot injuries. She's misinforming you because you shouldn't just go 'full pointe' you have to have a teacher approve you and you must get approved by your doctor.
So yeah, hope I answered you question! -good luck!
Ask your teacher, thats what I did. Just to play it safee (.
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