What should a technician avoid doing when using electric nail files?

Applying too much pressure on the nail when using electric nail files can lead to several issues, making this the correct answer. When excessive pressure is applied, it can cause damage to the natural nail bed, resulting in discomfort or even injury. Additionally, too much pressure can generate heat, which can lead to burns or further nail damage. A technician should use a gentle touch and allow the electric nail file to do the work, ensuring a smooth and safe filing process.

Changing the file speed frequently may disrupt the filing process but does not inherently damage the nail if done correctly. Using the file on dry nails is not advisable, as it can lead to fraying or tearing, but it doesn’t correlate with damaging the nail structure directly as excessive pressure does. Utilizing a file designed specifically for natural nails is important for safety and effectiveness, but this choice alone is not related to the risks associated with operating the file improperly.