Hopefully, I can give you some idea of my program which is probably not reflective of other programs as a whole. The schedule is highly specific to every program. Some are busier than others and some take home call and have no trauma.
On a non-head and neck rotation - wakeup 445, preround at 530/start notes, morning report at 615-630, afterwards write notes, do tasks for patients as directed, etc. Then, ORs start at 7 (which run every day), clinics start at 8 (multiple clinics which run everyday as well). If you arent on call, you would be done with clinic around 5pm - see if anyone needs help with postopping patients, pending consults or any other tasks. Depending on the clinic you may be writing notes like 6pm. You're done whenever the OR is done, depending on the cases sometimes you'd finish in the afternoon 3-5, but then you'd head to the dental school to see patients in the point and pull clinic til it closes at 5 and bail dental students out on extractions.
On a head and neck rotation - In the beginning I was prerounding 430-445/making head and neck list. Eventually 5 was a good start for me as I got up to speed. Round around 6 w/ head and neck team, attend morning report if possible/on call. Clinic days you'd be out around 5pm and probably write ntoes til 6pm. On OR days, the ORs start at 7. You could finish anywhere from 5pm-7pm on average and a few nights you'd get unlucky and go late into the night.
If you were on call, you stay overnight til the next day and work through the next day. If you're on trauma, expect multiple consults to come in that night. Non-trauma w/ tooth call is dependent, you might get some odontogenic abscesses, random crap from childrens, and patients that had some issue with their surgery. Sometimes OR cases will keep going into the night so if you're on call you'll take over for the intern that isn't on call.
My busiest call days were on Fridays, Saturdays and Sundays (makes sense that's when people go out, get drunk, do drugs, drive around etc) - I would preround and make the list at 630 and then team round at 7. Then, I would write notes and put in orders and there would be a lull where I would get some chill time and sometimes have to return some calls/pages. Then, I would be seeing face consults, evaluating fractures and repairing lacerations from 1pm-1am on the busiest days. There would be a lull and then maybe an orbit or mandible would come in around 3-4am. (for some reason, these patients love coming in then). There were a few rare times I had consults come in through the night and I had to finish a laceration after rounds. Some saturdays there would be an infection case in the morning. Sometimes, a laceration at childrens would have to go to the OR. There were days where I had 10-15 consults with many being lacerations (a large laceration can take hours) and was just working throughout my entire call.
This is specific to my program though so take it with a huge grain of salt. I know a lot of programs you're just chilling on call because I would facetime some buddies every now and then when we were both on call. Overall, how busy your day will be dependent on a lot of factors - call, OR cases going, clinic schedule, number of interns and noncats, day of the week, what season it is (summer is busiest), what region you're in (the south is warm at least 9 months of the year so people go outside and get hurt).