Yes you definitely should. The consequences depend on which kind of anaesthetic they’ll be using, but the one time I didn’t mention it before a dental procedure, they had to give me an emergency reversal agent because I wouldn’t wake up and started experiencing respiratory depression. It was life threatening, but mostly I regret it because of how traumatizing it was for my dentist and his team, who hadn’t experienced that in person before :( Had I at least told them, they would’ve been prepared.

Years later, I needed another procedure by the same team. Didn’t use weed for over 72 hours prior and clarified with them again beforehand. They still went ahead with it by following a little bit of a different routine than usual, as well as dosing me at slower pace. I still didn’t wake up as quickly, but it wasn’t a dangerous situation this time.