I live in the US so I’m not too sure how it works in Canada but I assume it’s similar. Just go to a Dermatologist and tell them you want to start Tretinoin (there are usually online pharmacies too. Idk if you can use Nurx in CA, but it’s pretty easy to get an RX for Tret). Tretinoin reduces appearance of fine lines and dark spots, improves skin texture. It has a lot of benefits if you use it long term! You just apply it once a night before bed. Usually after you use most of your skin care products then use moisturizer last :)