How to cancel wait() after a value is changed?

I have this script that drains health when a player's "Grabbed" value is set to true, and to stop draining health when the value is false.

The problem is, after the value turns false, if it is currently waiting to hurt the character again, it will still hurt the character after the grabbed value is false. Is there any way to stop this?

char.charactervalues.Grabbed.Changed:Connect(function()
	if char.charactervalues.Grabbed.Value == true then
		while true do
			if char.charactervalues.Grabbed.Value == false then
				break;
			end
			wait(1)
			char.Humanoid.Health -= 13
		end
	end
	end)

When using a while (condition) do loop, you should always pay attention to the condition part of it. For example, you can change your code to the following:

char.charactervalues.Grabbed.Changed:Connect(function()
    while char.charactervalues.Grabbed.Value and wait(1) do -- only runs if the player is currently grabbed, and has waited 1 second
            char.Humanoid.Health -= 13
    end
end)

This will wait 1 second before the player's health is diminished, but as soon as the player isn't grabbed anymore, the loop stops. If you don't want to wait 1 second before the health is diminished, you can add char.Humanoid.Health -= 13 before the while loop.