You switch your part to the opposite side and the roots lift, your bangs fall into your eyes, or one side looks heavy. When that happens, before you press the hair into shape hard with a comb, take a look at which way your dry hair naturally flows. Rather than moving far from your usual part all at once, trying positions a little at a time helps you find a place that is easy to manage.
Here we introduce a way to compare parts using the comb you have and a mirror. It is not a method for deciding the one position that suits your face shape, or for changing the direction your hair grows. Choose your candidates also considering whether you can style them comfortably in a busy morning and whether you can see in front.
1. Look at your usual part and the roots in dry hair

First, let your hair down and stand in front of a mirror with your usual part. Without tilting your head, in a posture close to your everyday one, look in order at where your bangs begin, the crown, and above each ear. Check not only the line of the part but whether the roots on both sides lie flat or lift.
If your hair is still damp after washing, don't decide on a position in that state alone. Its shape changes as it dries, so dry from the roots to the ends and use the look after the warmth has settled as your baseline. For areas you feel are not fully dry, lift the surface hair a little and check the inside too.
Before putting the comb through, lightly check with your fingers that your hair isn't tangled. Undo snagged strands a little at a time from the ends, and don't pull them out from the roots all at once. If the teeth of the comb are chipped or feel rough to the touch, don't use that tool; choose another.
Avoid pressing the tip of a comb into a spot with strong redness or pain on the scalp to draw a line. What you want to see here is the flow of your hair, not to fix a position by scraping your scalp. If touching it hurts, stop changing your part for that day.
How wide the visible scalp looks also changes with the lighting and the angle of your head. Don't decide about a change in hair volume or its cause from a single photo; this time, look at the hairstyle when changed from your usual position. If the lighting in front is strong, don't change where you stand during the comparison.
If you want to keep a record of the starting state, take one photo in front of the same mirror, or jot down brief notes such as "bangs flow to the right" or "above my left ear puffs up." Knowing the state before you tidy it into a clean straight line makes it easier to compare what changed later.
2. Instead of moving it to the opposite side all at once, try positions in small steps

Try the new position starting right next to your current part. With your fingertips, separate a little of the front hair and let it down to the left and right without pulling the roots hard. There is no fixed number of centimeters to move that will suit you. Look for a range you can manage, according to the length of your bangs and the direction of your hairline.
If you use a comb, separate the action of dividing the hair with its tip from the action of smoothing the hair's flow with its teeth. Run the tip gently between the strands, and don't press it against the scalp and trace over it again and again. If the comb has no pointed handle, don't force the same operation; part with your fingers and then run the teeth through.
You don't need to draw the line all the way to the back of your head at once. Let down a small area at the front and see whether it settles naturally or the roots lift. Rather than covering the hair with a big section toward the side you want to hide the part, start with an amount where you can see where the hair wants to part.

For a position that looks neat only while you pull hard, also check how it looks after you let go. If one side springs back right away or the roots bend sharply, make the distance you move smaller before pressing it down further. Completely flipping left to right does not need to be a condition for today's result.
When you make two candidates, keep the way you style after parting the same. If you add styling product to only one and nothing to the other, you have not compared position alone. First match the tools and the condition of your hair, and think about any finishing touches after you choose the position.
You don't have to insist on a straight part; there is also a way to let it down with the dividing line slightly blurred. Still, keep it separate from the action of rubbing the roots repeatedly the wrong way with a comb to make them puff up. Prioritize a position that settles even when you take your fingers away over pulling at fine hairs.
3. If the roots spring back, start from the area you can dry

If the roots still spring back when you try the position on dry hair, don't keep pressing your hair down hard; return it to the original for now. If you have time and a place where you can dry it fully, there is a way to section off a small portion of the roots you want to correct and style it. When you can't dry it away from home, pause before wetting a wide area.
If you use water, dampen your hands and work it in little by little over the roots you want to fix and the area around them. Don't assume that wetting only the surface ends means the direction of the roots has changed. Don't wet it so much that it drips; if it gets too wet, press it between a towel and take up the moisture without rubbing.
Use the dryer at the distance and setting given in its instructions, and don't bring the nozzle too close to your hair or scalp. Lift a section lightly with your fingers and send air to the roots, then smooth toward the ends. Don't keep the air on one spot or endure the heat to hold it in place.
If you dry it while pulling it hard to one side, it is easy to lose sight of how it looks once you let go. Release your fingers partway and work in small areas while watching how the hair falls. Also check that no dampness remains in the inside layers of overlapping hair, such as the bangs and above the ears.
Once your hair is dry, wait until the warmth settles, and use the cool setting on the device if needed. Judge by how it looks when let down naturally, not by how it looks while held with a comb. For the whole of drying, you can also check the basics of drying and blow-drying together.
Avoid clamping wet hair with a hair iron to style it because the roots are hard to move. Check each device's conditions for hair dryness and for use together with styling products. Rather than wetting and drying it again and again, you can also choose to keep the distance you move small today, or to return to the original part.
4. Compare not only the front but also the bangs and around the ears

When the position starts to settle, take your hands and the comb away and compare with the same mirror, lighting and standing place. Turn your face slightly left and right, and check that your bangs don't fall into your eyes and that hair isn't clumped above your ears. Look separately at the state with only one side tucked behind an ear and the state with both sides let down.
When you move the part, the amount of hair gathering to one side changes too. On the side where more hair overlaps, look not only at the line on the surface but at the thickness of the strands falling over your ear. Rather than treating all volume as bad, choose a candidate depending on whether you want to show your outline or enjoy the flow of the hair.
If the longer side of your bangs enters your field of view, check in your usual posture instead of hiding it by lifting your face or tilting your neck. If you tuck hair behind your ear, turn slightly left and right with it tucked and see whether it falls straight back. This is a procedure for checking your taste in looks and ease of wear separately.

If you normally wear glasses or a hat, try them on too. Look at changes when you add the item, such as strands getting caught in the temples of your glasses, or the hair returning to its original position when you take off a hat. However, keeping the roots pressed down with a hat is not a required step for changing your part.
If you use photos, match the height and distance you shoot from. On a screen that flips left and right, it is easy to mix up the side you see with the real left and right, so leaving a reason for your choice, such as "the one where my bangs don't fall into my eyes" rather than just "right is better," makes it easier to reproduce next time.
There is no need to decide one as the correct answer that makes your face look smaller. Among the front, the side, and a slightly moving view, choose the situations you care about and look at those. Even if only one angle looks neat, if you keep brushing your bangs aside, move the position back a little and compare again.
5. Before adding more hold, review the position and the steps one at a time

If you use a styling product to finish, check the amount, where to apply it, and whether it is for dry hair, according to the product you have. If you layer oil or wax because the roots won't move, it may feel heavier than you like. Don't confuse the work of choosing the position of the part with the finishing that holds the shape.
If you use a pin to support your bangs, don't stuff too many strands in, and fasten it where the tip doesn't touch your scalp. When removing it, don't pull the hair out; loosen it following the structure of the clip. If it hurts or slips easily, review the amount of hair and the tool before increasing the number of fasteners.
If it goes back to the original after some time, rather than redrawing the line on the spot again and again, check the area that went back. Separating whether it is only at the front or up to the crown helps you narrow down where to style next time. Even if it always returns to the same position, you don't need to push through with strong heat or force.
On the next day you try, change only one of the position, the area you dampen, and the drying order, and compare. Keep a record that pairs the condition with the result, like "parting it a little to the side made my bangs less likely to fall in my eyes." We set no deadline such as "it will certainly stick after so many days."
Depending on your hair length and cut, moving to the position you want may make the ends of your bangs hard to line up. Before pulling hard yourself or trimming more, there is the option of talking to a hair salon about your usual part and how you want it to look. Tell them how easy it is to style day to day as well.
If it doesn't feel right today, you're free to return to your usual part. Look at your dry roots, try the position in small steps, and let go to look at your bangs and around your ears. Using this order as a baseline, you can choose a candidate as a hairstyle you can keep up without strain, not just by taste.