Add lines in the header with a plugin

Hi,
I’m working on a simple plugin, and i have some problem.

I would like to apply my plugin changes (add some lines in the header) in only one page (with the X id by example).

To do that, i’m using that:

function addHeaderCode(){
(my added code)}

add_action('wp_head', 'addHeaderCode');

I maybe have to add a if before the add_action and check the current page ? but how to check it ? With the page_link ?

I’m lost, thx !!!