Botox - Canada

This probably isn’t the right sub for this, but I thought someone here might know. I live in Canada (Alberta specifically) and get Botox purely for cosmetic reasons. I keep getting mixed messages, do we tip or not?

My bill usually comes to around $300 for about 15 minutes of work. Some people say you’re not supposed to tip, but when I don’t, it feels like they’re disappointed (especially since the card reader gives the option).

What’s the norm here?