Having a partner can be great. Share the responsibility, share the decisions, share the work, cover for vacations, create a great schedule. All those are great reasons to have a partner. There are too many ways to get into a partnership to cover here. If you can imagine it, it can and has been done.
Here's the important part. Make sure you determine how it comes apart before you get in. Have multiple exit strategies in your written agreement because many partnerships do come apart for a variety of reasons. Younger buys out senior, one wants to relocate, you don't get along, you don't agree on growth, one of you disabled or dead, etc.
Put together a business plan in advance. Detail who has what responsibilities. Detail a budget for marketing (it can be in % if you've not found the right practice yet). Figure out how you will handle imbalances in CE, auto, travel, meals. What if you disagree on equipment? You need to account for each of you getting paid for your dentistry, paying all the bills, paying the debt service, and then splitting profits monthly or quarterly.
The SPOUSES. I put that in caps because you must all love being together. You must trust each other. If your spouses do not get along in advance, don't get into it. They will not learn to get along. Do not have either spouse working in the practice. Do not go into partnership with a dr of the other sex. It will cause pressure at home eventually.
Make sure you and partner have common growth strategy. I.E. will you be multiple practice owners? What if one of you wants multiple practices after a time, and the other does not?
Now that I've told you about all the land mines, keep in mind that lots of these partnerships work great. If you go in expecting trouble and address the problems in advance in the agreement, it can be great even if it comes apart since you'll have directions on how to take it apart. Imagine working Thurs, Fri, Sat, Mon, Tues, Wed and then not coming back until the Thursday a week later. Two weeks off every month. Think of the ball games, recitals, plays, teacher meetings, etc you will be able to attend. If you are home schooling, you can teach all the science and math for instance. Partnership is a goal worth striving for. Don't let me scare you away from it. It can be really great.