Conflicting information about the need for a deep dental teeth cleaning. My dentist says I don't need it & all info on the net says I need it?

[Jo!]

I went to the dentist on the 21st June. A few of my gums were swolen but nothing major. My dentist cleaned my teeth & said I have an early periodontal disease. My gums were pink, looking good after the clean. Suddenly after 11 day of having my teeth cleaned my gums got inflamed, red & shiny. I went to the hygienist on the 21st July to have another clean & while it helped with reducing the swelling, my gums were still red & inflamed. On the 1st August I went back to my dentist & he said that i don't need a deep clean as there was no plaque/tartar below the gumline (he said he could see that on the x-rays). It has been a whole month now & my gums are red, inflamed & shiny. All info online says one with any stage of periodontal disease should get a deep dental cleaning, while my dentist says no deep clean is necessary as he can see no tartar build up on tooth roots on the x-ray. What do i do with this conflicting information?