Touch a part and it removes 25 health everytime u touch it?

Put this script in a Part
If this works please accept my answer.

local debounce = false 
local HealthLoss = 25 -- Change this to the damage you need. 
function OnTouched(Part) 
if Part.Parent ~= nil then--Keep Parentless blocks from breaking it. 
if debounce == false and Part.Parent:findFirstChild("Humanoid") ~= nil then 
debounce = true 
Part.Parent:findFirstChild("Humanoid"):TakeDamage(HealthLoss) 
wait(2)--Wait two seconds before the brick can hurt someone. 
debounce = false 
end 
end 
end 
script.Parent.Touched:connect(OnTouched)

man, I'll give you this script, but this isn't a website where you just ask for a script and pronto, you need to put in effort yourself. Insert inside the part this script:

script.Parent.Touched:connect(function(hit)
    if hit and hit.Parent and hit.Parent:FindFirstChild("Humanoid") then
        hit.Parent.Humanoid.Health = hit.Parent.Humanoid.Health - 25
    end
end)

I won't give you it next time if you don't put forth any effort.