This article discusses the concept of dexis in scientific texts. Dexis, also known as deixis, refers to words and phrases that point to time, place, or person, and its use is different in scientific writing compared to spoken or informal language. In scientific texts, the use of dexis is more limited and often carefully controlled. However, some deictic expressions are still used to help guide readers through arguments, data, and interpretations. This paper shows how dexis works in scientific texts and why it matters for clarity and academic tone. It also includes examples and analysis from recent scientific articles. The goal is to help students and young researchers understand the role of dexis and improve their academic writing skills.