Arkansas Esthetician Practice Exam 2026 - Free Esthetician Practice Questions and Study Guide

Thickeners or viscosity modifiers are used to increase the density in emulsions and gel-type products, making them thicker and more viscous. This helps to improve the texture and consistency of the product, making it easier to apply and spread on the skin. This option is therefore correct.

Option B is incorrect because preservatives are used to prevent the growth of bacteria, not thicken the product.

Option C is incorrect because antioxidants are added to products for their anti-aging and protective properties, not to thicken the product.

Option D is incorrect because while some thickeners and viscosity modifiers may be derived from a silicone base, it is not their main purpose.