Вот предложения, нужно их исправить (они все не правельные ) (if you want delicious desert you should take special ingredient) (a doctor who prescription for us is very hand some guy) (the doctor told in that flashing his teeth should be part of his regulations)

If you want a delicious dessert you should use special ingredients.
The doctor who has written a prescription to us is a very handsome guy.
The doctor told us that flashing teeth should be part of our personality.