Final answer:
The safest device for tattoo removal is a laser, which breaks up the pigment without causing harm, unlike options like cheese graters or flamethrowers.
Step-by-step explanation:
The safest way to remove tattoos is to break up the pigment using a laser. Devices like a cheese grater, flamethrower, or toothbrush would either be ineffective or cause significant harm. Laser tattoo removal works by emitting short, intense pulses of light to penetrate the skin and break up the tattoo pigment particles. These fragmented particles are then absorbed and eliminated by the body's immune system over time. Multiple sessions are often required for complete removal depending on the size, color, and age of the tattoo.