Dr, What is the typical yearly recommended schedule for dental check-ups/cleanings?

Ans: Hi
If you brush and floss your teeth well - preferably after every meal - you may never need to get your teeth cleaned by a dentist.
However a visit to your dentist once every six months for a routine check up is advisable.

Ans: Hello sir/M'am,
How often you need to change your toothbrush depends entirely on your tooth brushing habits. If you're inclined to brush vigorously, exerting a lot of pressure (which is not good, you need to be gentle) then you may need to change your brush frequently.
If you use a HARD brush, it will last you longer. SUPER SOFT brushes will last the least. I normally recommend MEDIUM brushes if your gums are healthy.
The Golden rule, however, is to change your toothbrush when it starts to "flower". When the bristles curl outwards like the petals of a blossoming flower.