Practise is the correct form of the verb. Practice is strictly a noun, yet it is only an alternative spelling used as a verb, only by Americans

Americans are the only ones not to follow this rule.

You're the only ones to do so.

It's not.
Practice: noun. Practise: verb.
Advice: noun. Advise: verb.

No, I liked it too. It's the mouth stretching that I didn't like.

It so definitely was.

Lol downvoters can't spell. (I don't think it was you @silvermyth)

It's incorrect

Practise *

Their*

The thing is French has rules about spelling and pronunciation