Yes, this is how you would do it if you are attempting to get into dental school straight in after a 4 years bachelor's. You apply June after your Junior year.
Just to be absolutely clear::: For example, if you are graduating Spring of 2018 and want to start dental school Fall of 2018 immediately after summer vacation, you should apply June 2017 (so in about ~5-6 weeks). I hope that cleared this up. Please let me know if it didn't.