Seriously, I am so grateful to be married. Having my wife by my side has been wonderful (especially since she has gone through a similar situation - pharmacy school - and kows the stressors of a rigorous education). In a good marriage, you will force yourself to take time out from your studies to spend quality time with your spouse. Although it will probably not be the amount of time you would like, there is still time to keep the fires of love blazing.
Now, my wife and I have a lot of practice with forcing ourselves to find ways of making sure the other doesn't feel ignored or unloved. As I already stated, she was in pharmacy school once at the same time that I was serving on an aircraft carrier where I spent 26 of 37 months at sea. We had to find ways to let the other know we loved the other. So, now, we are able to utilize those experiences and not feel like we aren't appreciated.
For those of you who are dating, it is very possible to continue dating and make it work. Prioritization and balance to both your education and your love life is needed. Don't feel you must put it on hold in order to complete dental school successfully. Having a love one during dental school, whether it be living with each other or as a long distance one as my wife and I did when she was in school, is a blessing if you just take the time out for it. Think of this, yes, dentistry is your career. Some of you don't want to be distracted because this is your career on the line. But, the person you are dating may be your soulmate. Your soulmate will be with you for eternity - much longer than you will ever be a dentist. Take the time to make your love life work. You'll be rewarded over and over in the long run.