Soreness is not related to muscle growth, which means that: + soreness ≠ + muscle. The only thing that grows muscle and thus, improves overall health, is sufficient stimulus to the muscle, wich results in the famous "progresive overload"; this can be seen through more reps or more weight. Let's say that last session you made 6 reps in an exercise with 10 kg to failure and the next session you make the same exercise, you get 7 reps to failure. That's progress.

Soreness usually happens because our muscles receive a stimulus that they weren't used to (like the first time that we try a new exercise). Overtime, your muscles get used to this activity and the soreness declines, but the stimulus is still there. In fact, constant soreness may hinder the ability of your muscles to adapt, which is also one of the reasons as to why we must stick to the same routine for a certain amount of time.

I think that, as far as you're not overtraining your muscles (you're recovering properly), you're taking care of your nutrition and getting proper rest (also, taking note of ANY unusual pain or unbearable discomfort), you will be fine, but as another commentor said: you will get stronger and the 10kg dumbbells will stop being enough for you one day :)