Will general cleaning of gum prevent loss of tooth and loss of bone Kindly advise

My cousin was diagnosed periodontitis on his upper teeth. During the consultation, the periodontist told him there's a loss of bone shown in the x-ray, he can save his teeth -deep cleaning . He needs 3 visits at 3 wks intervals.

During his appt 3 days ago (40 day after his consultation), my cousin feared, the periodontist gave him a general cleaning on his gum in his entire mouth instead of deep cleaning & told him he need not have to come back again. Will general cleaning prevent loss of tooth and loss of bone? On 1st & 2nd day after general cleaning, he still feel inability to chew his food on the affected tooth. He can feel the nerve of the affected tooth when the lower tooth touches the affected upper tooth while chewing. It's uncomfortable. IS THIS TEMPORARY? On 3rd day, he felt his tooth a little better & stronger, however, will his affected tooth regain its strength & when can he eat solid food again? Does he need root canal treatment?

Can anyone please help to advise.Thk You.

If your cousin has bone loss, then he has small pockets between his teeth and gums that can trap small particles of food, or other things. Things that get trapped in the pockets will cause the gums to become quite sore and are extremely painful while chewing. A general cleaning probably didn't remove the contaminant in the pocket, because general cleanings don't go that deep.

There is a way for your cousin to clean the pockets in his teeth by himself, though. He can get an oral water jet, such as Oral B Water Pick, or even better an Hydro Floss. Those things will rinse particles from beneath the gum line, and quickly eliminate the pain that your cousin described. They are a bit painful to use, at first (especially on the affected tooth), but the gums quickly get used to the rinsing and after a few uses they are completely pain free.