If you have been diagnosed with periodontitis, you will find a great deal of advice online about toothbrushes and toothpastes. Most of it is not helpful, and some of it is actively counterproductive.
The short version: people with gum disease should use the same toothbrush and toothpaste as anyone else. What differs is not the product but the technique, and the addition of tools most people never use.
Start with what periodontitis actually is
Periodontal disease is not just a brushing problem. It is an inflammatory condition of the gum and the bone that supports the teeth, driven by bacterial plaque.
The sequence is usually: plaque builds up, the gum responds with inflammation and bleeds, the inflammation spreads to the bone, the bone is resorbed, and the tooth begins to loosen. The bleeding is not the disease. It is the visible symptom of a process that has been running for some time.
This is why the gums bleed, and it is why the treatment has to come from a dentist.
What treatment actually involves
The first stage is periodontal treatment: professional cleaning above and below the gum line, and where the deposits have hardened below it, scaling and root planing to clean and smooth the root surfaces. This is not the same as a routine scale and polish, and it usually takes more than one appointment.
For more advanced disease, surgery may be involved. Where the pockets are deep, a procedure to reduce them, or to regenerate lost bone, may be recommended.
No product on a bathroom shelf does any of this. This is worth stating plainly, because "periodontal" appears on a great deal of packaging. Toothpaste, brushes, mouthwash and water flossers cannot replace professional periodontal treatment. Products that suggest otherwise are either describing plaque control, which you can do yourself, or making a claim they cannot support.
The two purchases to ignore
Extra-soft or ultra-soft brushes. Healthy gums are not fragile. Bristles that are too soft flex away from the gum and clean less, which leaves you brushing for longer and achieving less. A soft brush is usually the right choice; going softer is not an upgrade. A good quality soft bristle brush, used properly, cleans adequately.
Bleeding-gum toothpaste. This one is worth spending a sentence on, because the logic is backwards.
Healthy gums do not normally bleed on their own or when brushed gently. Gums that bleed are inflamed, and that usually means the disease is not under control. A toothpaste that reduces bleeding may do so by suppressing inflammation or by masking the sign, rather than treating the cause. The bleeding stops; the cause does not. The result is that the clinical sign your dentist uses to monitor your condition has been suppressed or hidden, and the disease may carry on.
There are separate, legitimate desensitising toothpastes for sensitive exposed roots. Those are a different thing and are fine. The ones to avoid are those marketed specifically at bleeding gums.
What to use instead
Technique. The modified Bass technique, or any method where the bristles are angled slightly towards the gum line and small movements are used, cleaning the gum line rather than just the chewing surfaces. Many people brush the teeth and never brush the gum margin, which is where it matters.
Interdental brushes. These are more effective than floss for cleaning between teeth where there are gaps from gum recession, and most people with periodontal disease have exactly those gaps. Where the gap is too small for a brush, floss or tape.
Electric toothbrush and water flosser. Neither treats periodontal disease and neither is necessary. An electric toothbrush can lower the skill threshold for brushing, and a water flosser can help some people clean around braces, bridges or implants. However, a water flosser does not replace interdental brushes or floss where the gap allows them.
A maintenance schedule. This is the part that gets under-emphasised. Periodontal disease is a chronic condition and is managed, not cured. Maintenance visits, typically every three to four months, are what keep it stable. The most common reason for recurrence is not a failure of treatment but a return to a longer interval because things seemed fine.
If you are travelling
If you have active periodontal disease and are travelling for other dental work, say so at the consultation. Deep cleaning and any periodontal surgery should ideally be completed and settled before other treatment proceeds, and a clinician who knows your history will sequence it properly rather than treating around an unstable foundation.