I have been wondering what I should use between PP and PS in this particular context.
The last year, my friend bleached his teeth by a doctor, and today I want to do the same but I am puzzled and he tell me " It will work because it worked for me" or "It will work because it has worked for me"
Indeed, even though the action is past, there is a relevance in the present. But to me the past simple version is better.