Whether it’s been a while since your last interview, or you’re preparing for your first, take a look at these interview do’s and don’ts to prevent making an interview faux pas.

Do: Dress appropriately
If it’s your first interview, traditional interview garb, i.e. a suit with neutral accents, is your best option. You don’t want to wear anything too flashy, as it may be distracting to the interviewer. For working interviews, business casual is normally the way to go. You will look professional, but you will also be able to comfortably move around and treat patients.

Do: Arrive on time
Ideally, you should arrive 10 to 15 minutes before your scheduled interview time. If the practice is located in an area you’re not familiar with, you may want to do a test run a day or two prior to your interview, preferably at the same time. That way, you’ll have a better sense of traffic patterns and be able to set aside enough time for travel.

Do: Be courteous and respectful to everyone you meet
You never know who has a say in the final decision, so it is in your best interest to be on your best behavior. Remember, a little grace goes a long way.

Do: Have a positive attitude
Now, this doesn’t mean that you should dust off your pom-poms from high school and prepare a cheer, but you should be enthusiastic and optimistic about the position and what you can do for the practice. You could be the best doctor, technician, or receptionist for the job, but if you are perceived as being aloof, you decrease the chances of getting the job.

Do: Follow up with a thank you letter or e-mail
Within 48 hours of your interview, send a letter thanking the interviewer for meeting with you. It shouldn’t be too long, but it should reiterate your interest in the position, highlight key topics discussed in the interview, aw well as important information you didn’t get a chance to divulge.

Don’t: Be unprepared
While you can never know for sure what will be asked, you can take steps to prepare yourself for the interview. Do your research and find out as much as you can about the company, the staff, and, if possible, the clientele. It would also be beneficial for you to prepare answers to questions you know you’ll be asked. The more prepared you are, the more confident you will be.

Don’t: Make negative comments about previous employers or co-workers
Even if you left your last job because your boss was a “raving psycho,” there’s no need to mention it in an interview. Instead of complaining about prior job, focus on the opportunities the position you are applying for will provide you.

Don’t: Answer questions with a simple “yes” or “no”
An interview is your opportunity to show why you are the right person for the job, so make sure to fully answer every question and provide specific examples whenever possible. If a question catches you off guard, take a moment to collect your thoughts before you respond.

Don’t: Make excuses for your choices
Every decision you make—good or bad—is an opportunity to learn and grow. If the interviewer questions your past experiences, focus on the positive outcomes that decision had on you, both personally and professionally.

Don’t: Lie about your professional background
Chances are, your references will be contacted, and if they deny your claims, you will be taken out of the running for the position. Do yourself a favor and be honest. It really is the best policy.