How do i make a brick have health

To make a brick with a health bar:

• Create a model in workspace
• Add a part to the model and name it "Head"
• Add a Humanoid to the model
• Add a smoke object to the part named Head. Disable the smoke.
• Add a script to the model

Inside the script, add this code:

local humanoid = script.Parent.Humanoid
local smoke = script.Parent.Head.Smoke
humanoid.HealthChanged:connect(function(health)
	smoke.Enabled = health <= 50
end)

[Edit] I modified the logic in the script a little bit so that if the health of the humanoid increases above 50 (via a health regen script or something) then it will stop smoking.

Have fun!