Try to stay current and up to date on your entries. Daily, at the very least. If you're away from home for some reason or not near your logbook, at least get in the habit of carrying a small personal log to keep track of each flight, and what you did.
You didn't indicate if you keep a separate record of your activities with each student, but if you don't, it's especially important to keep track of this information on a flight-for-flight basis as you go. FAR 61.189 requires you to keep a log or record of instruction and endorsements given. Your logbook will suffice for this, but it's best to keep accurate and detailed records by making an entry each time you fly, or at least every day.
You may come to a point in the future when a former student attmepts to sue, or an insurance company comes calling, when you can show a detailed logbook showing every little thing you did with the student. A common mistake is to believe that the student will simply have all the endorsements and information in their logbook, but if the student has lost theirs, or is killed or missing, the information may not be available.
I experienced this only once, when a person with whom I had flown crashed an airplane. I had flown with that person for only a half hour, a year previously. I was contacted and told that I would be named in a lawsuit. I was able to demonstrate my minimal involvement with the student based on my own records in my logbook, and was subsequently left alone. I don't know what ever became of the case and the lawsuit, but I was left out of it. If I hadn't kept a specifc record of the flight and exactly what was done in connection with that flight, I might have been dragged into the mess.
Keep detailed records. It's only to your benifit.