One tooth growing on top and one tooth growing on the bottom is usually normal for babies and abnormal for adults.
For babies, the development is different, and the order of teething is not fixed, if the teeth belong to the state of normal growth, it is generally normal, but if the position of the teeth or the growth of the teeth is more abnormal, it is abnormal, and you need to go to the hospital in time for checkups, which is usually less common. For adults this situation is generally not normal, you need to go to the hospital in time.
The baby grows a tooth above and a tooth below usually need to adjust the diet structure, guarantee nutrition, pay attention to the intake and absorption of calcium, you can get more sunshine. Adopt a good lifestyle, pay attention to oral hygiene, ensure sufficient sleep.
If you have a tooth on top and a tooth on the bottom, you can go to the hospital for a checkup to avoid any abnormalities.