Dentist was working on a crown, and he placed goggles on my face to prevent water from splashing in my eyes.. can covid be transmitted to me that way? i'm a bit worried now.. my nerves are bad, always worried about this virus! it's hard!?

Any splashing water in this situation are contaminated only with your own oral fluids. So of course no significant risk. Also no risk from any exposure if you've been vaccinated. And most likely the dentist has been vaccinated as well.

Assume you are concerned that virus could be transmitted from the goggles themselves, from a previous patient? I would think the dental office staff would be carefully disinfecting them between patients but also the virus is transmitted by airborne droplets, not objects. COVID anxiety is real for many people, but I this situation should be fine. The peace of God described in the Bible helps!