Are we able to help younger students to develop their understanding and their use of the capital letter, dot and question mark by giving them intensive teaching on the subject during a short period, and would the effect be long lasting? I decided to investigate this together with young students in second and third grade and at the same time try to see which grade would benefit most. By using an experimental research design I conducted the investigation in a class with children from both grades where the result was compared with two similar control groups. The investigation lasted during five months, while the students were able to show their knowledge in the subject just before and after a two weeks period of intensive teaching and then again after four months. The result showed that the intensive teaching had an effect that lasted over time and that it was the students in second grade that would benefit most.