Usually people don't transfer oils like oil of peppermint by pouring, but rather drop by drop, a drop typically being around 20mg. That is a fine quantity to put in your mouth or your food. Turpentine (essential oil of pine resin) is the main exception. If you have enough essential oils in one place that splashing teaspoonfuls is common, you need to take additional precautions, probably at least a suitable respirator or active ventilation.