“Should I go for teeth cleanings more often?”

Cleanings help prevent cavities, but there are more important things that you should be doing to prevent them. I seldom find cavities in patients of record in my practice. First of all do not eat carbohydrates between meals including fruits, breads, dairy and starches. You can eat nuts and veggies. Also floss at least every other day and use an electric tooth brush. If you haven't already, then get sealants on back teeth which have not yet decayed. Lastly find a dentist who emphasized these ideas as well as other forms of prevention. At your rate you will live to 100 but your teeth won't.

If you have good home care, I don’t think you should have a new cavity every 6 months. Still, brushing and flossing your teeth is a must after each meal. My recommendation to you is to ask the dentist to show the cavity. They are easy to see with new technology like digital X-rays and intraoral cameras.
Good luck.

Small cavities are called Insidious lesion Center usually watched and not restored unless they increase in size. Your dentist is the guardian of your dental health and you should follow their instructions on the frequency of your appointments and fastidiously maintain good oral hygiene and even carry a travel brush for between meal. You do not need toothpaste

If you've had gum disease or specific problems, this may be warranted. Your dentist should know and make those recommendations.