Used to do

We use 'used to' for something that happened regularly in the past but no longer happens.

We also use it for something that was true but  no longer is.

'Used to do' is different from 'to be used to doing' and 'to get used to doing'

to be used to doing

We use 'to be used to doing' to say that something is normal, not unusual.

to get used to doing

We use 'to get used to doing' to talk about the process of something becoming normal for us.