How to check if a player is facing a certain object?

I'm attempting to activate a function when a player's head is facing a certain object.

I've tried using

(Humanoid.MoveDirection:Dot(workspace.CurrentCamera.CFrame.RightVector) <= 0.25)

but it turns out that it activates when a player isn't moving much to the right.

you can make the game first person and then if player's mouse is touching them execute the event or do something

you can do it like that

local plr = game.Players.LocalPlayer
local mouse = plr:GetMouse()

if mouse.Target == "The Object" then
print("put anything here")
end

local _, withinScreenBounds = Camera:WorldToScreenPoint(part.Position)

if withinScreenBounds then
   -- We have successfully detected if the player can see the part.
end

not sure I understood your question correctly but this should help you.